25697436208 has 20 divisors (see below), whose sum is σ = 50531900920. Its totient is φ = 12656945664.

The previous prime is 25697436173. The next prime is 25697436209. The reversal of 25697436208 is 80263479652.

It is not an unprimeable number, because it can be changed into a prime (25697436209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11984673 + ... + 11986816.

It is an arithmetic number, because the mean of its divisors is an integer number (2526595046).

Almost surely, 2^25697436208 is an apocalyptic number.

It is an amenable number.

25697436208 is a deficient number, since it is larger than the sum of its proper divisors (24834464712).

25697436208 is a wasteful number, since it uses less digits than its factorization.

25697436208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23971564 (or 23971558 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 52.

The spelling of 25697436208 in words is "twenty-five billion, six hundred ninety-seven million, four hundred thirty-six thousand, two hundred eight".