251225404124445 has 12 divisors (see below), whose sum is σ = 435457367149116. Its totient is φ = 133986882199680.

The previous prime is 251225404124419. The next prime is 251225404124467. The reversal of 251225404124445 is 544421404522152.

251225404124445 is a `hidden beast` number, since 2 + 5 + 1 + 2 + 2 + 540 + 41 + 24 + 4 + 45 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 35714225395044 + 215511178729401 = 5976138^2 + 14680299^2 .

It is not a de Polignac number, because 251225404124445 - 2⁵ = 251225404124413 is a prime.

It is a super-2 number, since 2×251225404124445² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 5582786758321 = 251225404124445 / (2 + 5 + 1 + 2 + 2 + 5 + 4 + 0 + 4 + 1 + 2 + 4 + 4 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 251225404124445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2791393379116 + ... + 2791393379205.

It is an arithmetic number, because the mean of its divisors is an integer number (36288113929093).

Almost surely, 2^{251225404124445} is an apocalyptic number.

It is an amenable number.

251225404124445 is a deficient number, since it is larger than the sum of its proper divisors (184231963024671).

251225404124445 is a wasteful number, since it uses less digits than its factorization.

251225404124445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5582786758332 (or 5582786758329 counting only the distinct ones).

The product of its (nonzero) digits is 2048000, while the sum is 45.

Adding to 251225404124445 its reverse (544421404522152), we get a palindrome (795646808646597).

The spelling of 251225404124445 in words is "two hundred fifty-one trillion, two hundred twenty-five billion, four hundred four million, one hundred twenty-four thousand, four hundred forty-five".