17979994395 has 72 divisors (see below), whose sum is σ = 34507575648. Its totient is φ = 8653582080.

The previous prime is 17979994387. The next prime is 17979994421. The reversal of 17979994395 is 59349997971.

17979994395 is a `hidden beast` number, since 17 + 97 + 9 + 99 + 439 + 5 = 666.

It is not a de Polignac number, because 17979994395 - 2³ = 17979994387 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 733914 + ... + 758016.

It is an arithmetic number, because the mean of its divisors is an integer number (479271884).

Almost surely, 2^17979994395 is an apocalyptic number.

17979994395 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

17979994395 is a deficient number, since it is larger than the sum of its proper divisors (16527581253).

17979994395 is a wasteful number, since it uses less digits than its factorization.

17979994395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24273 (or 24259 counting only the distinct ones).

The product of its digits is 173604060, while the sum is 72.

The spelling of 17979994395 in words is "seventeen billion, nine hundred seventy-nine million, nine hundred ninety-four thousand, three hundred ninety-five".