861023222165 has 16 divisors (see below), whose sum is σ = 1057432872960. Its totient is φ = 672830633280.

The previous prime is 861023222123. The next prime is 861023222287. The reversal of 861023222165 is 561222320168.

It is a happy number.

It is not a de Polignac number, because 861023222165 - 2⁸ = 861023221909 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 9248981 + ... + 9341610.

It is an arithmetic number, because the mean of its divisors is an integer number (66089554560).

Almost surely, 2^861023222165 is an apocalyptic number.

It is an amenable number.

861023222165 is a deficient number, since it is larger than the sum of its proper divisors (196409650795).

861023222165 is a wasteful number, since it uses less digits than its factorization.

861023222165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18590812.

The product of its (nonzero) digits is 69120, while the sum is 38.

The spelling of 861023222165 in words is "eight hundred sixty-one billion, twenty-three million, two hundred twenty-two thousand, one hundred sixty-five".