18763157765 has 16 divisors (see below), whose sum is σ = 24574587840. Its totient is φ = 13639317120.

The previous prime is 18763157759. The next prime is 18763157797. The reversal of 18763157765 is 56775136781.

It is a de Polignac number, because none of the positive numbers 2^k-18763157765 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18763157765.

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, 33242 + ... + 196548.

It is an arithmetic number, because the mean of its divisors is an integer number (1535911740).

Almost surely, 2^18763157765 is an apocalyptic number.

It is an amenable number.

18763157765 is a deficient number, since it is larger than the sum of its proper divisors (5811430075).

18763157765 is a wasteful number, since it uses less digits than its factorization.

18763157765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165412.

The product of its digits is 7408800, while the sum is 56.

The spelling of 18763157765 in words is "eighteen billion, seven hundred sixty-three million, one hundred fifty-seven thousand, seven hundred sixty-five".