51403776565631 has 32 divisors (see below), whose sum is σ = 60287999016960. Its totient is φ = 42910853894496.

The previous prime is 51403776565621. The next prime is 51403776565657. The reversal of 51403776565631 is 13656567730415.

It is not a de Polignac number, because 51403776565631 - 2²⁶ = 51403709456767 is a prime.

It is a super-2 number, since 2×51403776565631² (a number of 28 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 (51403776565621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 185269250 + ... + 185546496.

It is an arithmetic number, because the mean of its divisors is an integer number (1883999969280).

Almost surely, 2^{51403776565631} is an apocalyptic number.

51403776565631 is a deficient number, since it is larger than the sum of its proper divisors (8884222451329).

51403776565631 is a wasteful number, since it uses less digits than its factorization.

51403776565631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279083.

The product of its (nonzero) digits is 47628000, while the sum is 59.

The spelling of 51403776565631 in words is "fifty-one trillion, four hundred three billion, seven hundred seventy-six million, five hundred sixty-five thousand, six hundred thirty-one".