666424031 has 32 divisors (see below), whose sum is σ = 893222400. Its totient is φ = 482267520.

The previous prime is 666424027. The next prime is 666424043. The reversal of 666424031 is 130424666.

It is not a de Polignac number, because 666424031 - 2² = 666424027 is a prime.

It is a super-2 number, since 2×666424031² = 888241978188577922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666424001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43496 + ... + 56786.

It is an arithmetic number, because the mean of its divisors is an integer number (27913200).

Almost surely, 2^666424031 is an apocalyptic number.

666424031 is a deficient number, since it is larger than the sum of its proper divisors (226798369).

666424031 is a wasteful number, since it uses less digits than its factorization.

666424031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13359.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 666424031 is about 25815.1899276376. The cubic root of 666424031 is about 873.4744709871.

Adding to 666424031 its reverse (130424666), we get a palindrome (796848697).

The spelling of 666424031 in words is "six hundred sixty-six million, four hundred twenty-four thousand, thirty-one".