51172999994 has 16 divisors (see below), whose sum is σ = 77232113280. Its totient is φ = 25429404000.

The previous prime is 51172999987. The next prime is 51173000051. The reversal of 51172999994 is 49999927115.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51172999994.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122342 + ... + 342510.

It is an arithmetic number, because the mean of its divisors is an integer number (4827007080).

Almost surely, 2^51172999994 is an apocalyptic number.

51172999994 is a deficient number, since it is larger than the sum of its proper divisors (26059113286).

51172999994 is a wasteful number, since it uses less digits than its factorization.

51172999994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220885.

The product of its digits is 16533720, while the sum is 65.

The spelling of 51172999994 in words is "fifty-one billion, one hundred seventy-two million, nine hundred ninety-nine thousand, nine hundred ninety-four".