18977251372 has 6 divisors (see below), whose sum is σ = 33210189908. Its totient is φ = 9488625684.

The previous prime is 18977251343. The next prime is 18977251379. The reversal of 18977251372 is 27315277981.

It is not an unprimeable number, because it can be changed into a prime (18977251379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2372156418 + ... + 2372156425.

Almost surely, 2^18977251372 is an apocalyptic number.

It is an amenable number.

18977251372 is a deficient number, since it is larger than the sum of its proper divisors (14232938536).

18977251372 is a wasteful number, since it uses less digits than its factorization.

18977251372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4744312847 (or 4744312845 counting only the distinct ones).

The product of its digits is 1481760, while the sum is 52.

The spelling of 18977251372 in words is "eighteen billion, nine hundred seventy-seven million, two hundred fifty-one thousand, three hundred seventy-two".