251255225541 has 32 divisors (see below), whose sum is σ = 355276288000. Its totient is φ = 157502491200.

The previous prime is 251255225521. The next prime is 251255225563. The reversal of 251255225541 is 145522552152.

It is not a de Polignac number, because 251255225541 - 2¹⁸ = 251254963397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 251255225541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251255225521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10635060 + ... + 10658658.

It is an arithmetic number, because the mean of its divisors is an integer number (11102384000).

Almost surely, 2^251255225541 is an apocalyptic number.

It is an amenable number.

251255225541 is a deficient number, since it is larger than the sum of its proper divisors (104021062459).

251255225541 is a wasteful number, since it uses less digits than its factorization.

251255225541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25009.

The product of its digits is 200000, while the sum is 39.

Adding to 251255225541 its reverse (145522552152), we get a palindrome (396777777693).

The spelling of 251255225541 in words is "two hundred fifty-one billion, two hundred fifty-five million, two hundred twenty-five thousand, five hundred forty-one".