18671620361 has 4 divisors (see below), whose sum is σ = 18720371712. Its totient is φ = 18622869012.

The previous prime is 18671620351. The next prime is 18671620381. The reversal of 18671620361 is 16302617681.

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 18671620361 - 2³⁰ = 17597878537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18671620351) 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, 24375101 + ... + 24375866.

It is an arithmetic number, because the mean of its divisors is an integer number (4680092928).

Almost surely, 2^18671620361 is an apocalyptic number.

It is an amenable number.

18671620361 is a deficient number, since it is larger than the sum of its proper divisors (48751351).

18671620361 is an equidigital number, since it uses as much as digits as its factorization.

18671620361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48751350.

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 18671620361 in words is "eighteen billion, six hundred seventy-one million, six hundred twenty thousand, three hundred sixty-one".