18365672765 has 16 divisors (see below), whose sum is σ = 24553877760. Its totient is φ = 13072662720.

The previous prime is 18365672729. The next prime is 18365672789. The reversal of 18365672765 is 56727656381.

It is not a de Polignac number, because 18365672765 - 2²⁰ = 18364624189 is a prime.

It is a super-2 number, since 2×18365672765² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 18365672765.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3549770 + ... + 3554939.

It is an arithmetic number, because the mean of its divisors is an integer number (1534617360).

Almost surely, 2^18365672765 is an apocalyptic number.

It is an amenable number.

18365672765 is a deficient number, since it is larger than the sum of its proper divisors (6188204995).

18365672765 is a wasteful number, since it uses less digits than its factorization.

18365672765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7104772.

The product of its digits is 12700800, while the sum is 56.

The spelling of 18365672765 in words is "eighteen billion, three hundred sixty-five million, six hundred seventy-two thousand, seven hundred sixty-five".