664635701 has 4 divisors (see below), whose sum is σ = 667283904. Its totient is φ = 661987500.

The previous prime is 664635661. The next prime is 664635703. The reversal of 664635701 is 107536466.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-664635701 is a prime.

It is a super-2 number, since 2×664635701² = 883481230087522802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664635703) 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, 1323725 + ... + 1324226.

It is an arithmetic number, because the mean of its divisors is an integer number (166820976).

Almost surely, 2^664635701 is an apocalyptic number.

It is an amenable number.

664635701 is a deficient number, since it is larger than the sum of its proper divisors (2648203).

664635701 is a wasteful number, since it uses less digits than its factorization.

664635701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2648202.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 664635701 is about 25780.5294941745. The cubic root of 664635701 is about 872.6924564022.

The spelling of 664635701 in words is "six hundred sixty-four million, six hundred thirty-five thousand, seven hundred one".