16816993279 has 4 divisors (see below), whose sum is σ = 16817631480. Its totient is φ = 16816355080.

The previous prime is 16816993261. The next prime is 16816993301. The reversal of 16816993279 is 97239961861.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16816993279 is a prime.

It is a super-2 number, since 2×16816993279² (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 (16816993229) 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, 277792 + ... + 332869.

It is an arithmetic number, because the mean of its divisors is an integer number (4204407870).

Almost surely, 2^16816993279 is an apocalyptic number.

16816993279 is a deficient number, since it is larger than the sum of its proper divisors (638201).

16816993279 is an equidigital number, since it uses as much as digits as its factorization.

16816993279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638200.

The product of its digits is 8817984, while the sum is 61.

The spelling of 16816993279 in words is "sixteen billion, eight hundred sixteen million, nine hundred ninety-three thousand, two hundred seventy-nine".