25701618816 has 80 divisors (see below), whose sum is σ = 76487631990. Its totient is φ = 8567202816.

The previous prime is 25701618757. The next prime is 25701618823. The reversal of 25701618816 is 61881610752.

25701618816 is a `hidden beast` number, since 2 + 570 + 1 + 61 + 8 + 8 + 16 = 666.

It can be written as a sum of positive squares in only one way, i.e., 25250481216 + 451137600 = 158904^2 + 21240^2 .

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1229101 + ... + 1249836.

Almost surely, 2^25701618816 is an apocalyptic number.

It is an amenable number.

25701618816 is an abundant number, since it is smaller than the sum of its proper divisors (50786013174).

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

25701618816 is an equidigital number, since it uses as much as digits as its factorization.

25701618816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2478963 (or 2478942 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The spelling of 25701618816 in words is "twenty-five billion, seven hundred one million, six hundred eighteen thousand, eight hundred sixteen".