864511216687 has 4 divisors (see below), whose sum is σ = 865359609480. Its totient is φ = 863662823896.

The previous prime is 864511216651. The next prime is 864511216691. The reversal of 864511216687 is 786612115468.

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-864511216687 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 (864511211687) 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, 424194868 + ... + 424196905.

It is an arithmetic number, because the mean of its divisors is an integer number (216339902370).

Almost surely, 2^864511216687 is an apocalyptic number.

864511216687 is a deficient number, since it is larger than the sum of its proper divisors (848392793).

864511216687 is a wasteful number, since it uses less digits than its factorization.

864511216687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848392792.

The product of its digits is 3870720, while the sum is 55.

The spelling of 864511216687 in words is "eight hundred sixty-four billion, five hundred eleven million, two hundred sixteen thousand, six hundred eighty-seven".