668783412531 has 72 divisors (see below), whose sum is σ = 1076799499776. Its totient is φ = 399574244160.

The previous prime is 668783412511. The next prime is 668783412533. The reversal of 668783412531 is 135214387866.

668783412531 is a `hidden beast` number, since 6 + 6 + 8 + 78 + 34 + 1 + 2 + 531 = 666.

668783412531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 668783412531 - 2¹¹ = 668783410483 is a prime.

It is a super-2 number, since 2×668783412531² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (668783412533) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 10891686 + ... + 10952916.

It is an arithmetic number, because the mean of its divisors is an integer number (14955548608).

Almost surely, 2^668783412531 is an apocalyptic number.

668783412531 is a deficient number, since it is larger than the sum of its proper divisors (408016087245).

668783412531 is a wasteful number, since it uses less digits than its factorization.

668783412531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61473 (or 61457 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The spelling of 668783412531 in words is "six hundred sixty-eight billion, seven hundred eighty-three million, four hundred twelve thousand, five hundred thirty-one".