635664005 has 4 divisors (see below), whose sum is σ = 762796812. Its totient is φ = 508531200.

The previous prime is 635663999. The next prime is 635664011. The reversal of 635664005 is 500466536.

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

It is an interprime number because it is at equal distance from previous prime (635663999) and next prime (635664011).

It can be written as a sum of positive squares in 2 ways, for example, as 257089156 + 378574849 = 16034^2 + 19457^2 .

It is not a de Polignac number, because 635664005 - 2²² = 631469701 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, 63566396 + ... + 63566405.

It is an arithmetic number, because the mean of its divisors is an integer number (190699203).

Almost surely, 2^635664005 is an apocalyptic number.

It is an amenable number.

635664005 is a deficient number, since it is larger than the sum of its proper divisors (127132807).

635664005 is a wasteful number, since it uses less digits than its factorization.

635664005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127132806.

The product of its (nonzero) digits is 64800, while the sum is 35.

The square root of 635664005 is about 25212.3780116037. The cubic root of 635664005 is about 859.8232938728.

The spelling of 635664005 in words is "six hundred thirty-five million, six hundred sixty-four thousand, five".