78121082166 has 32 divisors (see below), whose sum is σ = 156550437888. Its totient is φ = 25989020640.

The previous prime is 78121082129. The next prime is 78121082183. The reversal of 78121082166 is 66128012187.

It is a super-2 number, since 2×78121082166² (a number of 23 digits) contains 22 as substring.

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, 14445435 + ... + 14450841.

It is an arithmetic number, because the mean of its divisors is an integer number (4892201184).

Almost surely, 2^78121082166 is an apocalyptic number.

78121082166 is an abundant number, since it is smaller than the sum of its proper divisors (78429355722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78121082166 is a wasteful number, since it uses less digits than its factorization.

78121082166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9716.

The product of its (nonzero) digits is 64512, while the sum is 42.

The spelling of 78121082166 in words is "seventy-eight billion, one hundred twenty-one million, eighty-two thousand, one hundred sixty-six".