25540256164 has 24 divisors (see below), whose sum is σ = 45477992000. Its totient is φ = 12547003680.

The previous prime is 25540256149. The next prime is 25540256177. The reversal of 25540256164 is 46165204552.

It is a happy 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, 167287 + ... + 281185.

Almost surely, 2^25540256164 is an apocalyptic number.

It is an amenable number.

25540256164 is a deficient number, since it is larger than the sum of its proper divisors (19937735836).

25540256164 is a wasteful number, since it uses less digits than its factorization.

25540256164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114883 (or 114881 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 40.

The spelling of 25540256164 in words is "twenty-five billion, five hundred forty million, two hundred fifty-six thousand, one hundred sixty-four".