18916907979 has 16 divisors (see below), whose sum is σ = 25290777600. Its totient is φ = 12577189536.

The previous prime is 18916907939. The next prime is 18916907987. The reversal of 18916907979 is 97970961981.

It is not a de Polignac number, because 18916907979 - 2¹⁶ = 18916842443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18916907909) 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, 3220257 + ... + 3226125.

It is an arithmetic number, because the mean of its divisors is an integer number (1580673600).

Almost surely, 2^18916907979 is an apocalyptic number.

18916907979 is a deficient number, since it is larger than the sum of its proper divisors (6373869621).

18916907979 is a wasteful number, since it uses less digits than its factorization.

18916907979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8594.

The product of its (nonzero) digits is 15431472, while the sum is 66.

The spelling of 18916907979 in words is "eighteen billion, nine hundred sixteen million, nine hundred seven thousand, nine hundred seventy-nine".