635979913013 has 4 divisors (see below), whose sum is σ = 635981533260. Its totient is φ = 635978292768.

The previous prime is 635979913007. The next prime is 635979913033. The reversal of 635979913013 is 310319979536.

635979913013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 351414211204 + 284565701809 = 592802^2 + 533447^2 .

It is a cyclic number.

It is not a de Polignac number, because 635979913013 - 2¹⁰ = 635979911989 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 635979913013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (635979913033) 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, 191243 + ... + 1143911.

It is an arithmetic number, because the mean of its divisors is an integer number (158995383315).

Almost surely, 2^635979913013 is an apocalyptic number.

It is an amenable number.

635979913013 is a deficient number, since it is larger than the sum of its proper divisors (1620247).

635979913013 is an equidigital number, since it uses as much as digits as its factorization.

635979913013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1620246.

The product of its (nonzero) digits is 4133430, while the sum is 56.

The spelling of 635979913013 in words is "six hundred thirty-five billion, nine hundred seventy-nine million, nine hundred thirteen thousand, thirteen".