664680513 has 8 divisors (see below), whose sum is σ = 1012846528. Its totient is φ = 379817424.

The previous prime is 664680449. The next prime is 664680563. The reversal of 664680513 is 315086466.

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

It is not a de Polignac number, because 664680513 - 2⁶ = 664680449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664680563) 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, 15825706 + ... + 15825747.

It is an arithmetic number, because the mean of its divisors is an integer number (126605816).

Almost surely, 2^664680513 is an apocalyptic number.

It is an amenable number.

664680513 is a deficient number, since it is larger than the sum of its proper divisors (348166015).

664680513 is a wasteful number, since it uses less digits than its factorization.

664680513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31651463.

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 664680513 is about 25781.3985850264. The cubic root of 664680513 is about 872.7120692595.

The spelling of 664680513 in words is "six hundred sixty-four million, six hundred eighty thousand, five hundred thirteen".