891163400863 has 4 divisors (see below), whose sum is σ = 896314634568. Its totient is φ = 886012167160.

The previous prime is 891163400833. The next prime is 891163400917. The reversal of 891163400863 is 368004361198.

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

It is a cyclic number.

It is not a de Polignac number, because 891163400863 - 2²⁹ = 890626529951 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 (891163400833) 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, 2575616593 + ... + 2575616938.

It is an arithmetic number, because the mean of its divisors is an integer number (224078658642).

Almost surely, 2^891163400863 is an apocalyptic number.

891163400863 is a deficient number, since it is larger than the sum of its proper divisors (5151233705).

891163400863 is a wasteful number, since it uses less digits than its factorization.

891163400863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5151233704.

The product of its (nonzero) digits is 746496, while the sum is 49.

The spelling of 891163400863 in words is "eight hundred ninety-one billion, one hundred sixty-three million, four hundred thousand, eight hundred sixty-three".