664741635 has 16 divisors (see below), whose sum is σ = 1083655584. Its totient is φ = 347839232.

The previous prime is 664741589. The next prime is 664741661. The reversal of 664741635 is 536147466.

It is a cyclic number.

It is not a de Polignac number, because 664741635 - 2⁸ = 664741379 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 417282 + ... + 418871.

It is an arithmetic number, because the mean of its divisors is an integer number (67728474).

Almost surely, 2^664741635 is an apocalyptic number.

664741635 is a deficient number, since it is larger than the sum of its proper divisors (418913949).

664741635 is a wasteful number, since it uses less digits than its factorization.

664741635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836214.

The product of its digits is 362880, while the sum is 42.

The square root of 664741635 is about 25782.5839473083. The cubic root of 664741635 is about 872.7388190895.

The spelling of 664741635 in words is "six hundred sixty-four million, seven hundred forty-one thousand, six hundred thirty-five".