18216011979 has 24 divisors (see below), whose sum is σ = 29108312064. Its totient is φ = 10884510000.

The previous prime is 18216011969. The next prime is 18216011993. The reversal of 18216011979 is 97911061281.

It is a happy number.

18216011979 is a `hidden beast` number, since 1 + 8 + 21 + 601 + 19 + 7 + 9 = 666.

It is not a de Polignac number, because 18216011979 - 2⁴ = 18216011963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18216011969) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1288747 + ... + 1302804.

It is an arithmetic number, because the mean of its divisors is an integer number (1212846336).

Almost surely, 2^18216011979 is an apocalyptic number.

18216011979 is a deficient number, since it is larger than the sum of its proper divisors (10892300085).

18216011979 is a wasteful number, since it uses less digits than its factorization.

18216011979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2591639 (or 2591636 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 45.

The spelling of 18216011979 in words is "eighteen billion, two hundred sixteen million, eleven thousand, nine hundred seventy-nine".