18310061813 has 4 divisors (see below), whose sum is σ = 18735877248. Its totient is φ = 17884246380.

The previous prime is 18310061807. The next prime is 18310061821. The reversal of 18310061813 is 31816001381.

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 18310061813 - 2²⁰ = 18309013237 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 18310061813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18310061843) 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, 212907653 + ... + 212907738.

It is an arithmetic number, because the mean of its divisors is an integer number (4683969312).

Almost surely, 2^18310061813 is an apocalyptic number.

It is an amenable number.

18310061813 is a deficient number, since it is larger than the sum of its proper divisors (425815435).

18310061813 is an equidigital number, since it uses as much as digits as its factorization.

18310061813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425815434.

The product of its (nonzero) digits is 3456, while the sum is 32.

The spelling of 18310061813 in words is "eighteen billion, three hundred ten million, sixty-one thousand, eight hundred thirteen".