18977651814 has 32 divisors (see below), whose sum is σ = 41467044096. Its totient is φ = 5742295520.

The previous prime is 18977651813. The next prime is 18977651857. The reversal of 18977651814 is 41815677981.

It is a super-4 number, since 4×18977651814⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18977651813) 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, 167682 + ... + 257045.

It is an arithmetic number, because the mean of its divisors is an integer number (1295845128).

Almost surely, 2^18977651814 is an apocalyptic number.

18977651814 is an abundant number, since it is smaller than the sum of its proper divisors (22489392282).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18977651814 is a wasteful number, since it uses less digits than its factorization.

18977651814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425420.

The product of its digits is 3386880, while the sum is 57.

The spelling of 18977651814 in words is "eighteen billion, nine hundred seventy-seven million, six hundred fifty-one thousand, eight hundred fourteen".