16717205979 has 40 divisors (see below), whose sum is σ = 26163196928. Its totient is φ = 10624212720.

The previous prime is 16717205963. The next prime is 16717206029. The reversal of 16717205979 is 97950271761.

It is a happy number.

16717205979 is a `hidden beast` number, since 16 + 7 + 17 + 20 + 597 + 9 = 666.

It is not a de Polignac number, because 16717205979 - 2⁴ = 16717205963 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16717205279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 118554 + ... + 217920.

Almost surely, 2^16717205979 is an apocalyptic number.

16717205979 is a deficient number, since it is larger than the sum of its proper divisors (9445990949).

16717205979 is an equidigital number, since it uses as much as digits as its factorization.

16717205979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99477 (or 99468 counting only the distinct ones).

The product of its (nonzero) digits is 1666980, while the sum is 54.

The spelling of 16717205979 in words is "sixteen billion, seven hundred seventeen million, two hundred five thousand, nine hundred seventy-nine".