25561926988 has 48 divisors (see below), whose sum is σ = 51096122784. Its totient is φ = 11084682240.

The previous prime is 25561926889. The next prime is 25561927031. The reversal of 25561926988 is 88962916552.

It is a super-5 number, since 5×25561926988⁵ (a number of 53 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 494278 + ... + 543538.

It is an arithmetic number, because the mean of its divisors is an integer number (1064502558).

Almost surely, 2^25561926988 is an apocalyptic number.

It is an amenable number.

25561926988 is a deficient number, since it is larger than the sum of its proper divisors (25534195796).

25561926988 is a wasteful number, since it uses less digits than its factorization.

25561926988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49882 (or 49880 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 61.

The spelling of 25561926988 in words is "twenty-five billion, five hundred sixty-one million, nine hundred twenty-six thousand, nine hundred eighty-eight".