664624121 has 16 divisors (see below), whose sum is σ = 778039680. Its totient is φ = 555984000.

The previous prime is 664624109. The next prime is 664624139. The reversal of 664624121 is 121426466.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664624121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664624171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44621 + ... + 57621.

It is an arithmetic number, because the mean of its divisors is an integer number (48627480).

Almost surely, 2^664624121 is an apocalyptic number.

It is an amenable number.

664624121 is a deficient number, since it is larger than the sum of its proper divisors (113415559).

664624121 is a wasteful number, since it uses less digits than its factorization.

664624121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13184.

The product of its digits is 13824, while the sum is 32.

The square root of 664624121 is about 25780.3049051015. The cubic root of 664624121 is about 872.6873880430.

The spelling of 664624121 in words is "six hundred sixty-four million, six hundred twenty-four thousand, one hundred twenty-one".