18977651848 has 8 divisors (see below), whose sum is σ = 35583097230. Its totient is φ = 9488825920.

The previous prime is 18977651813. The next prime is 18977651857. The reversal of 18977651848 is 84815677981.

It can be written as a sum of positive squares in only one way, i.e., 17635308804 + 1342343044 = 132798^2 + 36638^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 18977651848.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1186103233 + ... + 1186103248.

Almost surely, 2^18977651848 is an apocalyptic number.

It is an amenable number.

18977651848 is a deficient number, since it is larger than the sum of its proper divisors (16605445382).

18977651848 is a wasteful number, since it uses less digits than its factorization.

18977651848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2372206487 (or 2372206483 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 64.

The spelling of 18977651848 in words is "eighteen billion, nine hundred seventy-seven million, six hundred fifty-one thousand, eight hundred forty-eight".