111671864817 has 16 divisors (see below), whose sum is σ = 151215009792. Its totient is φ = 73289739600.

The previous prime is 111671864797. The next prime is 111671864831. The reversal of 111671864817 is 718468176111.

It is a happy number.

It is not a de Polignac number, because 111671864817 - 2⁸ = 111671864561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111671864817.

It is not an unprimeable number, because it can be changed into a prime (111671864897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137692 + ... + 492242.

It is an arithmetic number, because the mean of its divisors is an integer number (9450938112).

Almost surely, 2^111671864817 is an apocalyptic number.

It is an amenable number.

111671864817 is a deficient number, since it is larger than the sum of its proper divisors (39543144975).

111671864817 is a wasteful number, since it uses less digits than its factorization.

111671864817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356188.

The product of its digits is 451584, while the sum is 51.

The spelling of 111671864817 in words is "one hundred eleven billion, six hundred seventy-one million, eight hundred sixty-four thousand, eight hundred seventeen".