51155646631 has 8 divisors (see below), whose sum is σ = 51759797760. Its totient is φ = 50553947232.

The previous prime is 51155646617. The next prime is 51155646733. The reversal of 51155646631 is 13664655115.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51155646631 - 2⁵ = 51155646599 is a prime.

It is a super-2 number, since 2×51155646631² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51155646931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 570940 + ... + 654433.

It is an arithmetic number, because the mean of its divisors is an integer number (6469974720).

Almost surely, 2^51155646631 is an apocalyptic number.

51155646631 is a deficient number, since it is larger than the sum of its proper divisors (604151129).

51155646631 is a wasteful number, since it uses less digits than its factorization.

51155646631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225865.

The product of its digits is 324000, while the sum is 43.

The spelling of 51155646631 in words is "fifty-one billion, one hundred fifty-five million, six hundred forty-six thousand, six hundred thirty-one".