25999131560 has 64 divisors (see below), whose sum is σ = 63449885520. Its totient is φ = 9549168640.

The previous prime is 25999131523. The next prime is 25999131569. The reversal of 25999131560 is 6513199952.

It can be written as a sum of positive squares in 8 ways, for example, as 1226260324 + 24772871236 = 35018^2 + 157394^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25999131499 and 25999131508.

It is not an unprimeable number, because it can be changed into a prime (25999131569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 438389 + ... + 494148.

Almost surely, 2^25999131560 is an apocalyptic number.

25999131560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25999131560 is an abundant number, since it is smaller than the sum of its proper divisors (37450753960).

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

25999131560 is a wasteful number, since it uses less digits than its factorization.

25999131560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932606 (or 932602 counting only the distinct ones).

The product of its (nonzero) digits is 656100, while the sum is 50.

The spelling of 25999131560 in words is "twenty-five billion, nine hundred ninety-nine million, one hundred thirty-one thousand, five hundred sixty".