666562431 has 16 divisors (see below), whose sum is σ = 903135744. Its totient is φ = 437198784.

The previous prime is 666562423. The next prime is 666562441. The reversal of 666562431 is 134265666.

It is not a de Polignac number, because 666562431 - 2³ = 666562423 is a prime.

It is a super-2 number, since 2×666562431² = 888610948841259522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 666562431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666562411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 218986 + ... + 222008.

It is an arithmetic number, because the mean of its divisors is an integer number (56445984).

Almost surely, 2^666562431 is an apocalyptic number.

666562431 is a deficient number, since it is larger than the sum of its proper divisors (236573313).

666562431 is a wasteful number, since it uses less digits than its factorization.

666562431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4190.

The product of its digits is 155520, while the sum is 39.

The square root of 666562431 is about 25817.8703808041. The cubic root of 666562431 is about 873.5349332421.

It can be divided in two parts, 6665 and 62431, that added together give a palindrome (69096).

The spelling of 666562431 in words is "six hundred sixty-six million, five hundred sixty-two thousand, four hundred thirty-one".