516431638665 has 12 divisors (see below), whose sum is σ = 895148173764. Its totient is φ = 275430207264.

The previous prime is 516431638663. The next prime is 516431638693. The reversal of 516431638665 is 566836134615.

516431638665 is a `hidden beast` number, since 5 + 16 + 431 + 63 + 86 + 65 = 666.

516431638665 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 149748102729 + 366683535936 = 386973^2 + 605544^2 .

It is not a de Polignac number, because 516431638665 - 2¹ = 516431638663 is a prime.

It is a super-3 number, since 3×516431638665³ (a number of 36 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (516431638663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5738129274 + ... + 5738129363.

It is an arithmetic number, because the mean of its divisors is an integer number (74595681147).

Almost surely, 2^516431638665 is an apocalyptic number.

It is an amenable number.

516431638665 is a deficient number, since it is larger than the sum of its proper divisors (378716535099).

516431638665 is a wasteful number, since it uses less digits than its factorization.

516431638665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11476258648 (or 11476258645 counting only the distinct ones).

The product of its digits is 9331200, while the sum is 54.

The spelling of 516431638665 in words is "five hundred sixteen billion, four hundred thirty-one million, six hundred thirty-eight thousand, six hundred sixty-five".