16507979939 has 4 divisors (see below), whose sum is σ = 18008705400. Its totient is φ = 15007254480.

The previous prime is 16507979869. The next prime is 16507979951. The reversal of 16507979939 is 93997970561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16507979939 - 2¹⁶ = 16507914403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16507979959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 750362714 + ... + 750362735.

It is an arithmetic number, because the mean of its divisors is an integer number (4502176350).

Almost surely, 2^16507979939 is an apocalyptic number.

16507979939 is a deficient number, since it is larger than the sum of its proper divisors (1500725461).

16507979939 is a wasteful number, since it uses less digits than its factorization.

16507979939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1500725460.

The product of its (nonzero) digits is 28934010, while the sum is 65.

The spelling of 16507979939 in words is "sixteen billion, five hundred seven million, nine hundred seventy-nine thousand, nine hundred thirty-nine".