664634735 has 4 divisors (see below), whose sum is σ = 797561688. Its totient is φ = 531707784.

The previous prime is 664634717. The next prime is 664634743. The reversal of 664634735 is 537436466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 664634735 - 2⁶ = 664634671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66463469 + ... + 66463478.

It is an arithmetic number, because the mean of its divisors is an integer number (199390422).

Almost surely, 2^664634735 is an apocalyptic number.

664634735 is a deficient number, since it is larger than the sum of its proper divisors (132926953).

664634735 is a wasteful number, since it uses less digits than its factorization.

664634735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132926952.

The product of its digits is 1088640, while the sum is 44.

The square root of 664634735 is about 25780.5107590986. The cubic root of 664634735 is about 872.6920336035.

The spelling of 664634735 in words is "six hundred sixty-four million, six hundred thirty-four thousand, seven hundred thirty-five".