25557117993 has 12 divisors (see below), whose sum is σ = 40271822448. Its totient is φ = 15489162360.

The previous prime is 25557117979. The next prime is 25557117997. The reversal of 25557117993 is 39971175552.

25557117993 is a `hidden beast` number, since 2 + 5 + 557 + 11 + 79 + 9 + 3 = 666.

It is not a de Polignac number, because 25557117993 - 2²⁹ = 25020247081 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25557117997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129076255 + ... + 129076452.

It is an arithmetic number, because the mean of its divisors is an integer number (3355985204).

Almost surely, 2^25557117993 is an apocalyptic number.

It is an amenable number.

25557117993 is a deficient number, since it is larger than the sum of its proper divisors (14714704455).

25557117993 is a wasteful number, since it uses less digits than its factorization.

25557117993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258152724 (or 258152721 counting only the distinct ones).

The product of its digits is 2976750, while the sum is 54.

The spelling of 25557117993 in words is "twenty-five billion, five hundred fifty-seven million, one hundred seventeen thousand, nine hundred ninety-three".