251345235425 has 12 divisors (see below), whose sum is σ = 312880816236. Its totient is φ = 200293785600.

The previous prime is 251345235403. The next prime is 251345235437. The reversal of 251345235425 is 524532543152.

It can be written as a sum of positive squares in 6 ways, for example, as 2100663889 + 249244571536 = 45833^2 + 499244^2 .

It is not a de Polignac number, because 251345235425 - 2¹⁰ = 251345234401 is a prime.

It is a Duffinian 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, 19553516 + ... + 19566365.

It is an arithmetic number, because the mean of its divisors is an integer number (26073401353).

Almost surely, 2^251345235425 is an apocalyptic number.

251345235425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

251345235425 is a deficient number, since it is larger than the sum of its proper divisors (61535580811).

251345235425 is a wasteful number, since it uses less digits than its factorization.

251345235425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39120148 (or 39120143 counting only the distinct ones).

The product of its digits is 720000, while the sum is 41.

Adding to 251345235425 its reverse (524532543152), we get a palindrome (775877778577).

The spelling of 251345235425 in words is "two hundred fifty-one billion, three hundred forty-five million, two hundred thirty-five thousand, four hundred twenty-five".