18681673966945 has 128 divisors (see below), whose sum is σ = 26977370112000. Its totient is φ = 12274109971200.

The previous prime is 18681673966939. The next prime is 18681673966961. The reversal of 18681673966945 is 54966937618681.

It is not a de Polignac number, because 18681673966945 - 2⁵ = 18681673966913 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2426502706 + ... + 2426510404.

It is an arithmetic number, because the mean of its divisors is an integer number (210760704000).

Almost surely, 2^{18681673966945} is an apocalyptic number.

It is an amenable number.

18681673966945 is a deficient number, since it is larger than the sum of its proper divisors (8295696145055).

18681673966945 is a wasteful number, since it uses less digits than its factorization.

18681673966945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9251.

The product of its digits is 2821754880, while the sum is 79.

The spelling of 18681673966945 in words is "eighteen trillion, six hundred eighty-one billion, six hundred seventy-three million, nine hundred sixty-six thousand, nine hundred forty-five".