664505101 has 32 divisors (see below), whose sum is σ = 765072000. Its totient is φ = 572721408.

The previous prime is 664505087. The next prime is 664505113. The reversal of 664505101 is 101505466.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664505101 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 664505101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664505131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2901655 + ... + 2901883.

It is an arithmetic number, because the mean of its divisors is an integer number (23908500).

Almost surely, 2^664505101 is an apocalyptic number.

It is an amenable number.

664505101 is a deficient number, since it is larger than the sum of its proper divisors (100566899).

664505101 is a wasteful number, since it uses less digits than its factorization.

664505101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 664505101 is about 25777.9964504614. The cubic root of 664505101 is about 872.6352917025.

The spelling of 664505101 in words is "six hundred sixty-four million, five hundred five thousand, one hundred one".