18502145720663 has 4 divisors (see below), whose sum is σ = 20184158968008. Its totient is φ = 16820132473320.

The previous prime is 18502145720659. The next prime is 18502145720671. The reversal of 18502145720663 is 36602754120581.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18502145720663 - 2² = 18502145720659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18502145720603) 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, 841006623656 + ... + 841006623677.

It is an arithmetic number, because the mean of its divisors is an integer number (5046039742002).

Almost surely, 2^{18502145720663} is an apocalyptic number.

18502145720663 is a deficient number, since it is larger than the sum of its proper divisors (1682013247345).

18502145720663 is a wasteful number, since it uses less digits than its factorization.

18502145720663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1682013247344.

The product of its (nonzero) digits is 2419200, while the sum is 50.

The spelling of 18502145720663 in words is "eighteen trillion, five hundred two billion, one hundred forty-five million, seven hundred twenty thousand, six hundred sixty-three".