25981566000 has 160 divisors (see below), whose sum is σ = 90208267968. Its totient is φ = 6395443200.

The previous prime is 25981565993. The next prime is 25981566047. The reversal of 25981566000 is 66518952.

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, 88549 + ... + 244548.

Almost surely, 2^25981566000 is an apocalyptic number.

25981566000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25981566000 is an abundant number, since it is smaller than the sum of its proper divisors (64226701968).

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

25981566000 is a wasteful number, since it uses less digits than its factorization.

25981566000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333136 (or 333120 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 42.

The spelling of 25981566000 in words is "twenty-five billion, nine hundred eighty-one million, five hundred sixty-six thousand".