51075811806 has 16 divisors (see below), whose sum is σ = 108160542864. Its totient is φ = 16023784064.

The previous prime is 51075811793. The next prime is 51075811859. The reversal of 51075811806 is 60811857015.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250371525 + ... + 250371728.

It is an arithmetic number, because the mean of its divisors is an integer number (6760033929).

Almost surely, 2^51075811806 is an apocalyptic number.

51075811806 is an abundant number, since it is smaller than the sum of its proper divisors (57084731058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51075811806 is a wasteful number, since it uses less digits than its factorization.

51075811806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500743275.

The product of its (nonzero) digits is 67200, while the sum is 42.

The spelling of 51075811806 in words is "fifty-one billion, seventy-five million, eight hundred eleven thousand, eight hundred six".