51811036594 has 4 divisors (see below), whose sum is σ = 77716554894. Its totient is φ = 25905518296.

The previous prime is 51811036567. The next prime is 51811036609. The reversal of 51811036594 is 49563011815.

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

It can be written as a sum of positive squares in only one way, i.e., 28566070225 + 23244966369 = 169015^2 + 152463^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51811036594.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12952759147 + ... + 12952759150.

Almost surely, 2^51811036594 is an apocalyptic number.

51811036594 is a deficient number, since it is larger than the sum of its proper divisors (25905518300).

51811036594 is a wasteful number, since it uses less digits than its factorization.

51811036594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25905518299.

The product of its (nonzero) digits is 129600, while the sum is 43.

The spelling of 51811036594 in words is "fifty-one billion, eight hundred eleven million, thirty-six thousand, five hundred ninety-four".