664044031 has 6 divisors (see below), whose sum is σ = 772459440. Its totient is φ = 569180556.

The previous prime is 664044019. The next prime is 664044061. The reversal of 664044031 is 130440466.

It is a happy number.

It is not a de Polignac number, because 664044031 - 2⁵ = 664043999 is a prime.

It is a super-2 number, since 2×664044031² = 881908950213457922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664044061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6775911 + ... + 6776008.

It is an arithmetic number, because the mean of its divisors is an integer number (128743240).

Almost surely, 2^664044031 is an apocalyptic number.

664044031 is a deficient number, since it is larger than the sum of its proper divisors (108415409).

664044031 is a wasteful number, since it uses less digits than its factorization.

664044031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13551933 (or 13551926 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 664044031 is about 25769.0518063820. The cubic root of 664044031 is about 872.4334176332.

Adding to 664044031 its reverse (130440466), we get a palindrome (794484497).

The spelling of 664044031 in words is "six hundred sixty-four million, forty-four thousand, thirty-one".