25557137956 has 81 divisors (see below), whose sum is σ = 55000930257. Its totient is φ = 10359316800.

The previous prime is 25557137939. The next prime is 25557137993. The reversal of 25557137956 is 65973175552.

It is a happy number.

The square root of 25557137956 is 159866.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 21481592356 + 4075545600 = 146566^2 + 63840^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25557137897 and 25557137906.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 42524056 + ... + 42524656.

Almost surely, 2^25557137956 is an apocalyptic number.

25557137956 is the 159866-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25557137956

25557137956 is an abundant number, since it is smaller than the sum of its proper divisors (29443792301).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25557137956 is an equidigital number, since it uses as much as digits as its factorization.

25557137956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258 (or 629 counting only the distinct ones).

The product of its digits is 9922500, while the sum is 55.

The spelling of 25557137956 in words is "twenty-five billion, five hundred fifty-seven million, one hundred thirty-seven thousand, nine hundred fifty-six".