18630642613 has 6 divisors (see below), whose sum is σ = 20478309782. Its totient is φ = 16936947720.

The previous prime is 18630642581. The next prime is 18630642629. The reversal of 18630642613 is 31624603681.

It can be written as a sum of positive squares in only one way, i.e., 16810937649 + 1819704964 = 129657^2 + 42658^2 .

It is not a de Polignac number, because 18630642613 - 2⁵ = 18630642581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18630642673) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 76986006 + ... + 76986247.

Almost surely, 2^18630642613 is an apocalyptic number.

It is an amenable number.

18630642613 is a deficient number, since it is larger than the sum of its proper divisors (1847667169).

18630642613 is a wasteful number, since it uses less digits than its factorization.

18630642613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153972275 (or 153972264 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 40.

The spelling of 18630642613 in words is "eighteen billion, six hundred thirty million, six hundred forty-two thousand, six hundred thirteen".