251112565525 has 12 divisors (see below), whose sum is σ = 314462550564. Its totient is φ = 198901040000.

The previous prime is 251112565489. The next prime is 251112565537. The reversal of 251112565525 is 525565211152.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 6988625604 + 244123939921 = 83598^2 + 494089^2 .

It is not a de Polignac number, because 251112565525 - 2³¹ = 248965081877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49722736 + ... + 49727785.

It is an arithmetic number, because the mean of its divisors is an integer number (26205212547).

Almost surely, 2^251112565525 is an apocalyptic number.

251112565525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

251112565525 is a deficient number, since it is larger than the sum of its proper divisors (63349985039).

251112565525 is a wasteful number, since it uses less digits than its factorization.

251112565525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99450632 (or 99450627 counting only the distinct ones).

The product of its digits is 150000, while the sum is 40.

Adding to 251112565525 its reverse (525565211152), we get a palindrome (776677776677).

The spelling of 251112565525 in words is "two hundred fifty-one billion, one hundred twelve million, five hundred sixty-five thousand, five hundred twenty-five".