25863402978 has 64 divisors (see below), whose sum is σ = 67949856000. Its totient is φ = 7134728832.

The previous prime is 25863402959. The next prime is 25863403001. The reversal of 25863402978 is 87920436852.

25863402978 is a `hidden beast` number, since 2 + 5 + 8 + 6 + 340 + 297 + 8 = 666.

It is a super-2 number, since 2×25863402978² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 1168723 + ... + 1190646.

It is an arithmetic number, because the mean of its divisors is an integer number (1061716500).

Almost surely, 2^25863402978 is an apocalyptic number.

25863402978 is an abundant number, since it is smaller than the sum of its proper divisors (42086453022).

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

25863402978 is a wasteful number, since it uses less digits than its factorization.

25863402978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2359416 (or 2359410 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 54.

The spelling of 25863402978 in words is "twenty-five billion, eight hundred sixty-three million, four hundred two thousand, nine hundred seventy-eight".