25911797402 has 4 divisors (see below), whose sum is σ = 38867696106. Its totient is φ = 12955898700.

The previous prime is 25911797389. The next prime is 25911797437. The reversal of 25911797402 is 20479711952.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15155825881 + 10755971521 = 123109^2 + 103711^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6477949349 + ... + 6477949352.

Almost surely, 2^25911797402 is an apocalyptic number.

25911797402 is a deficient number, since it is larger than the sum of its proper divisors (12955898704).

25911797402 is a wasteful number, since it uses less digits than its factorization.

25911797402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12955898703.

The product of its (nonzero) digits is 317520, while the sum is 47.

The spelling of 25911797402 in words is "twenty-five billion, nine hundred eleven million, seven hundred ninety-seven thousand, four hundred two".