18656260613 has 4 divisors (see below), whose sum is σ = 18972468480. Its totient is φ = 18340052748.

The previous prime is 18656260589. The next prime is 18656260633. The reversal of 18656260613 is 31606265681.

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 18656260613 - 2²² = 18652066309 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 (18656260633) 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, 158103845 + ... + 158103962.

It is an arithmetic number, because the mean of its divisors is an integer number (4743117120).

Almost surely, 2^18656260613 is an apocalyptic number.

It is an amenable number.

18656260613 is a deficient number, since it is larger than the sum of its proper divisors (316207867).

18656260613 is an equidigital number, since it uses as much as digits as its factorization.

18656260613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316207866.

The product of its (nonzero) digits is 311040, while the sum is 44.

The spelling of 18656260613 in words is "eighteen billion, six hundred fifty-six million, two hundred sixty thousand, six hundred thirteen".