18981618864577 has 8 divisors (see below), whose sum is σ = 19006978903200. Its totient is φ = 18956274656160.

The previous prime is 18981618864547. The next prime is 18981618864589. The reversal of 18981618864577 is 77546881618981.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18981618864577 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18981618864497 and 18981618864506.

It is not an unprimeable number, because it can be changed into a prime (18981618864547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1556827 + ... + 6355072.

It is an arithmetic number, because the mean of its divisors is an integer number (2375872362900).

Almost surely, 2^{18981618864577} is an apocalyptic number.

It is an amenable number.

18981618864577 is a deficient number, since it is larger than the sum of its proper divisors (25360038623).

18981618864577 is a wasteful number, since it uses less digits than its factorization.

18981618864577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7915103.

The product of its digits is 1300561920, while the sum is 79.

The spelling of 18981618864577 in words is "eighteen trillion, nine hundred eighty-one billion, six hundred eighteen million, eight hundred sixty-four thousand, five hundred seventy-seven".