51559931695 has 4 divisors (see below), whose sum is σ = 61871918040. Its totient is φ = 41247945352.

The previous prime is 51559931663. The next prime is 51559931707. The reversal of 51559931695 is 59613995515.

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

It is a cyclic number.

It is not a de Polignac number, because 51559931695 - 2⁵ = 51559931663 is a prime.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 5155993165 + ... + 5155993174.

It is an arithmetic number, because the mean of its divisors is an integer number (15467979510).

Almost surely, 2^51559931695 is an apocalyptic number.

51559931695 is a deficient number, since it is larger than the sum of its proper divisors (10311986345).

51559931695 is a wasteful number, since it uses less digits than its factorization.

51559931695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10311986344.

The product of its digits is 8201250, while the sum is 58.

The spelling of 51559931695 in words is "fifty-one billion, five hundred fifty-nine million, nine hundred thirty-one thousand, six hundred ninety-five".