505644360931 has 16 divisors (see below), whose sum is σ = 523118736000. Its totient is φ = 488420134720.

The previous prime is 505644360901. The next prime is 505644360937. The reversal of 505644360931 is 139063446505.

It is a cyclic number.

It is not a de Polignac number, because 505644360931 - 2⁵ = 505644360899 is a prime.

It is a super-2 number, since 2×505644360931² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505644360937) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7807320 + ... + 7871818.

It is an arithmetic number, because the mean of its divisors is an integer number (32694921000).

Almost surely, 2^505644360931 is an apocalyptic number.

505644360931 is a deficient number, since it is larger than the sum of its proper divisors (17474375069).

505644360931 is a wasteful number, since it uses less digits than its factorization.

505644360931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66434.

The product of its (nonzero) digits is 1166400, while the sum is 46.

The spelling of 505644360931 in words is "five hundred five billion, six hundred forty-four million, three hundred sixty thousand, nine hundred thirty-one".