18122861765 has 8 divisors (see below), whose sum is σ = 21781259808. Its totient is φ = 14475738960.

The previous prime is 18122861723. The next prime is 18122861797. The reversal of 18122861765 is 56716822181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-18122861765 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2815271 + ... + 2821700.

It is an arithmetic number, because the mean of its divisors is an integer number (2722657476).

Almost surely, 2^18122861765 is an apocalyptic number.

It is an amenable number.

18122861765 is a deficient number, since it is larger than the sum of its proper divisors (3658398043).

18122861765 is an equidigital number, since it uses as much as digits as its factorization.

18122861765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5637619.

The product of its digits is 322560, while the sum is 47.

The spelling of 18122861765 in words is "eighteen billion, one hundred twenty-two million, eight hundred sixty-one thousand, seven hundred sixty-five".