861646812562165 has 16 divisors (see below), whose sum is σ = 1199324177488512. Its totient is φ = 582024968483904.

The previous prime is 861646812562111. The next prime is 861646812562177. The reversal of 861646812562165 is 561265218646168.

It is a cyclic number.

It is not a de Polignac number, because 861646812562165 - 2¹¹ = 861646812560117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (67).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 861646812562165.

It is a congruent 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, 183720000334 + ... + 183720005023.

It is an arithmetic number, because the mean of its divisors is an integer number (74957761093032).

Almost surely, 2^{861646812562165} is an apocalyptic number.

It is an amenable number.

861646812562165 is a deficient number, since it is larger than the sum of its proper divisors (337677364926347).

861646812562165 is a wasteful number, since it uses less digits than its factorization.

861646812562165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367440005436.

The product of its digits is 199065600, while the sum is 67.

The spelling of 861646812562165 in words is "eight hundred sixty-one trillion, six hundred forty-six billion, eight hundred twelve million, five hundred sixty-two thousand, one hundred sixty-five".