25397785918 has 16 divisors (see below), whose sum is σ = 38277536976. Its totient is φ = 12638733120.

The previous prime is 25397785843. The next prime is 25397785961. The reversal of 25397785918 is 81958779352.

It is a self number, because there is not a number n which added to its sum of digits gives 25397785918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 377713 + ... + 439843.

It is an arithmetic number, because the mean of its divisors is an integer number (2392346061).

Almost surely, 2^25397785918 is an apocalyptic number.

25397785918 is a deficient number, since it is larger than the sum of its proper divisors (12879751058).

25397785918 is a wasteful number, since it uses less digits than its factorization.

25397785918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63099.

The product of its digits is 38102400, while the sum is 64.

The spelling of 25397785918 in words is "twenty-five billion, three hundred ninety-seven million, seven hundred eighty-five thousand, nine hundred eighteen".