664745201 has 4 divisors (see below), whose sum is σ = 664950000. Its totient is φ = 664540404.

The previous prime is 664745197. The next prime is 664745231. The reversal of 664745201 is 102547466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 664745201 - 2² = 664745197 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664745231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97451 + ... + 104048.

It is an arithmetic number, because the mean of its divisors is an integer number (166237500).

Almost surely, 2^664745201 is an apocalyptic number.

It is an amenable number.

664745201 is a deficient number, since it is larger than the sum of its proper divisors (204799).

664745201 is a wasteful number, since it uses less digits than its factorization.

664745201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204798.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 664745201 is about 25782.6531024253. The cubic root of 664745201 is about 872.7403796863.

The spelling of 664745201 in words is "six hundred sixty-four million, seven hundred forty-five thousand, two hundred one".