16979207781 has 8 divisors (see below), whose sum is σ = 22662359104. Its totient is φ = 11307764160.

The previous prime is 16979207753. The next prime is 16979207803. The reversal of 16979207781 is 18770297961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16979207781 - 2⁶ = 16979207717 is a prime.

It is a super-2 number, since 2×16979207781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16979207281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2923540 + ... + 2929341.

It is an arithmetic number, because the mean of its divisors is an integer number (2832794888).

Almost surely, 2^16979207781 is an apocalyptic number.

It is an amenable number.

16979207781 is a deficient number, since it is larger than the sum of its proper divisors (5683151323).

16979207781 is an equidigital number, since it uses as much as digits as its factorization.

16979207781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5853851.

The product of its (nonzero) digits is 2667168, while the sum is 57.

The spelling of 16979207781 in words is "sixteen billion, nine hundred seventy-nine million, two hundred seven thousand, seven hundred eighty-one".