25505647860 has 96 divisors (see below), whose sum is σ = 89037914112. Its totient is φ = 5299873920.

The previous prime is 25505647841. The next prime is 25505647883. The reversal of 25505647860 is 6874650552.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2755732 + ... + 2764971.

It is an arithmetic number, because the mean of its divisors is an integer number (927478272).

Almost surely, 2^25505647860 is an apocalyptic number.

25505647860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25505647860 is an abundant number, since it is smaller than the sum of its proper divisors (63532266252).

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

25505647860 is a wasteful number, since it uses less digits than its factorization.

25505647860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5520733 (or 5520731 counting only the distinct ones).

The product of its (nonzero) digits is 2016000, while the sum is 48.

The spelling of 25505647860 in words is "twenty-five billion, five hundred five million, six hundred forty-seven thousand, eight hundred sixty".