18912237660 has 72 divisors (see below), whose sum is σ = 57554152656. Its totient is φ = 5026821120.

The previous prime is 18912237629. The next prime is 18912237679. The reversal of 18912237660 is 6673221981.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 115861 + ... + 226380.

Almost surely, 2^18912237660 is an apocalyptic number.

18912237660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18912237660 is an abundant number, since it is smaller than the sum of its proper divisors (38641914996).

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

18912237660 is a wasteful number, since it uses less digits than its factorization.

18912237660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342563 (or 342558 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 18912237660 in words is "eighteen billion, nine hundred twelve million, two hundred thirty-seven thousand, six hundred sixty".