16393944879 has 18 divisors (see below), whose sum is σ = 25641813600. Its totient is φ = 10088580528.

The previous prime is 16393944871. The next prime is 16393944881. The reversal of 16393944879 is 97844939361.

16393944879 is a `hidden beast` number, since 1 + 63 + 9 + 3 + 94 + 487 + 9 = 666.

It is not a de Polignac number, because 16393944879 - 2³ = 16393944871 is a prime.

It is a super-2 number, since 2×16393944879² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16393944871) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5387679 + ... + 5390720.

It is an arithmetic number, because the mean of its divisors is an integer number (1424545200).

Almost surely, 2^16393944879 is an apocalyptic number.

16393944879 is a deficient number, since it is larger than the sum of its proper divisors (9247868721).

16393944879 is a wasteful number, since it uses less digits than its factorization.

16393944879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10778431 (or 10778415 counting only the distinct ones).

The product of its digits is 35271936, while the sum is 63.

The spelling of 16393944879 in words is "sixteen billion, three hundred ninety-three million, nine hundred forty-four thousand, eight hundred seventy-nine".