635664013 has 4 divisors (see below), whose sum is σ = 636653248. Its totient is φ = 634674780.

The previous prime is 635664011. The next prime is 635664023. The reversal of 635664013 is 310466536.

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 635664013 - 2¹ = 635664011 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 635664013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (635664011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 493653 + ... + 494938.

It is an arithmetic number, because the mean of its divisors is an integer number (159163312).

Almost surely, 2^635664013 is an apocalyptic number.

It is an amenable number.

635664013 is a deficient number, since it is larger than the sum of its proper divisors (989235).

635664013 is an equidigital number, since it uses as much as digits as its factorization.

635664013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989234.

The product of its (nonzero) digits is 38880, while the sum is 34.

The square root of 635664013 is about 25212.3781702560. The cubic root of 635664013 is about 859.8232974798.

The spelling of 635664013 in words is "six hundred thirty-five million, six hundred sixty-four thousand, thirteen".