864816312187 has 4 divisors (see below), whose sum is σ = 872898707736. Its totient is φ = 856733916640.

The previous prime is 864816312167. The next prime is 864816312197. The reversal of 864816312187 is 781213618468.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-864816312187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (864816312167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4041197614 + ... + 4041197827.

It is an arithmetic number, because the mean of its divisors is an integer number (218224676934).

Almost surely, 2^864816312187 is an apocalyptic number.

864816312187 is a deficient number, since it is larger than the sum of its proper divisors (8082395549).

864816312187 is a wasteful number, since it uses less digits than its factorization.

864816312187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8082395548.

The product of its digits is 3096576, while the sum is 55.

The spelling of 864816312187 in words is "eight hundred sixty-four billion, eight hundred sixteen million, three hundred twelve thousand, one hundred eighty-seven".