664932081 has 8 divisors (see below), whose sum is σ = 967173984. Its totient is φ = 402989120.

The previous prime is 664932071. The next prime is 664932089. The reversal of 664932081 is 180239466.

664932081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 664932081 - 2⁵ = 664932049 is a prime.

It is a super-2 number, since 2×664932081² = 884269344685981122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664932089) 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, 10074696 + ... + 10074761.

It is an arithmetic number, because the mean of its divisors is an integer number (120896748).

Almost surely, 2^664932081 is an apocalyptic number.

It is an amenable number.

664932081 is a deficient number, since it is larger than the sum of its proper divisors (302241903).

664932081 is a wasteful number, since it uses less digits than its factorization.

664932081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20149471.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 664932081 is about 25786.2769899030. The cubic root of 664932081 is about 872.8221566039.

The spelling of 664932081 in words is "six hundred sixty-four million, nine hundred thirty-two thousand, eighty-one".