18657790797 has 16 divisors (see below), whose sum is σ = 25002498240. Its totient is φ = 12375875712.

The previous prime is 18657790787. The next prime is 18657790843. The reversal of 18657790797 is 79709775681.

It is not a de Polignac number, because 18657790797 - 2⁶ = 18657790733 is a prime.

It is a super-2 number, since 2×18657790797² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18657790757) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1185979 + ... + 1201607.

It is an arithmetic number, because the mean of its divisors is an integer number (1562656140).

Almost surely, 2^18657790797 is an apocalyptic number.

It is an amenable number.

18657790797 is a deficient number, since it is larger than the sum of its proper divisors (6344707443).

18657790797 is a wasteful number, since it uses less digits than its factorization.

18657790797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17612.

The product of its (nonzero) digits is 46675440, while the sum is 66.

The spelling of 18657790797 in words is "eighteen billion, six hundred fifty-seven million, seven hundred ninety thousand, seven hundred ninety-seven".