25516345536 has 168 divisors, whose sum is σ = 82538773200. Its totient is φ = 7465543680.

The previous prime is 25516345529. The next prime is 25516345537. The reversal of 25516345536 is 63554361552.

25516345536 is a `hidden beast` number, since 2 + 5 + 5 + 1 + 634 + 5 + 5 + 3 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 25516345491 and 25516345500.

It is not an unprimeable number, because it can be changed into a prime (25516345537) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 114310 + ... + 253178.

Almost surely, 2^25516345536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25516345536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41269386600).

25516345536 is an abundant number, since it is smaller than the sum of its proper divisors (57022427664).

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

25516345536 is a wasteful number, since it uses less digits than its factorization.

25516345536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138927 (or 138914 counting only the distinct ones).

The product of its digits is 1620000, while the sum is 45.

The spelling of 25516345536 in words is "twenty-five billion, five hundred sixteen million, three hundred forty-five thousand, five hundred thirty-six".