18642781662793 has 32 divisors (see below), whose sum is σ = 19213020288000. Its totient is φ = 18083445082560.

The previous prime is 18642781662727. The next prime is 18642781662823. The reversal of 18642781662793 is 39726618724681.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18642781662793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18642781672793) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3402585628 + ... + 3402591106.

It is an arithmetic number, because the mean of its divisors is an integer number (600406884000).

Almost surely, 2^{18642781662793} is an apocalyptic number.

It is an amenable number.

18642781662793 is a deficient number, since it is larger than the sum of its proper divisors (570238625207).

18642781662793 is a wasteful number, since it uses less digits than its factorization.

18642781662793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8605.

The product of its digits is 292626432, while the sum is 70.

The spelling of 18642781662793 in words is "eighteen trillion, six hundred forty-two billion, seven hundred eighty-one million, six hundred sixty-two thousand, seven hundred ninety-three".