51000005005 has 4 divisors (see below), whose sum is σ = 61200006012. Its totient is φ = 40800004000.

The previous prime is 51000004999. The next prime is 51000005033. The reversal of 51000005005 is 50050000015.

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

It can be written as a sum of positive squares in 2 ways, for example, as 26593129476 + 24406875529 = 163074^2 + 156227^2 .

It is not a de Polignac number, because 51000005005 - 2⁵ = 51000004973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51000005005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5100000496 + ... + 5100000505.

It is an arithmetic number, because the mean of its divisors is an integer number (15300001503).

Almost surely, 2^51000005005 is an apocalyptic number.

It is an amenable number.

51000005005 is a deficient number, since it is larger than the sum of its proper divisors (10200001007).

51000005005 is a wasteful number, since it uses less digits than its factorization.

51000005005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10200001006.

The product of its (nonzero) digits is 125, while the sum is 16.

The spelling of 51000005005 in words is "fifty-one billion, five thousand, five".