25057992978 has 30 divisors (see below), whose sum is σ = 56152980741. Its totient is φ = 8351992728.

The previous prime is 25057992929. The next prime is 25057992983. The reversal of 25057992978 is 87929975052.

25057992978 is a `hidden beast` number, since 2 + 50 + 579 + 9 + 2 + 9 + 7 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17187996609 + 7869996369 = 131103^2 + 88713^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=111933.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 2008576 + ... + 2021012.

Almost surely, 2^25057992978 is an apocalyptic number.

25057992978 is an abundant number, since it is smaller than the sum of its proper divisors (31094987763).

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

25057992978 is an frugal number, since it uses more digits than its factorization.

25057992978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24888 (or 12442 counting only the distinct ones).

The product of its (nonzero) digits is 28576800, while the sum is 63.

The spelling of 25057992978 in words is "twenty-five billion, fifty-seven million, nine hundred ninety-two thousand, nine hundred seventy-eight".