891868964440945 has 16 divisors (see below), whose sum is σ = 1072462555358208. Its totient is φ = 712015366789440.

The previous prime is 891868964440931. The next prime is 891868964440969. The reversal of 891868964440945 is 549044469868198.

It is a de Polignac number, because none of the positive numbers 2^k-891868964440945 is a prime.

It is a Duffinian 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, 114766240 + ... + 122290750.

It is an arithmetic number, because the mean of its divisors is an integer number (67028909709888).

Almost surely, 2^{891868964440945} is an apocalyptic number.

It is an amenable number.

891868964440945 is a deficient number, since it is larger than the sum of its proper divisors (180593590917263).

891868964440945 is a wasteful number, since it uses less digits than its factorization.

891868964440945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7573680.

The product of its (nonzero) digits is 17199267840, while the sum is 85.

The spelling of 891868964440945 in words is "eight hundred ninety-one trillion, eight hundred sixty-eight billion, nine hundred sixty-four million, four hundred forty thousand, nine hundred forty-five".