664581031 has 8 divisors (see below), whose sum is σ = 711028400. Its totient is φ = 619280640.

The previous prime is 664581019. The next prime is 664581037. The reversal of 664581031 is 130185466.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 664581031 - 2⁵ = 664580999 is a prime.

It is a super-2 number, since 2×664581031² = 883335893530045922, 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 (664581037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 285546 + ... + 287863.

It is an arithmetic number, because the mean of its divisors is an integer number (88878550).

Almost surely, 2^664581031 is an apocalyptic number.

664581031 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

664581031 is a deficient number, since it is larger than the sum of its proper divisors (46447369).

664581031 is a wasteful number, since it uses less digits than its factorization.

664581031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573489.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 664581031 is about 25779.4691760711. The cubic root of 664581031 is about 872.6685278026.

The spelling of 664581031 in words is "six hundred sixty-four million, five hundred eighty-one thousand, thirty-one".