78806066164 has 72 divisors (see below), whose sum is σ = 163684717952. Its totient is φ = 32511983040.

The previous prime is 78806066161. The next prime is 78806066219. The reversal of 78806066164 is 46166060887.

It is a happy number.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78806066161) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3762529 + ... + 3783415.

Almost surely, 2^78806066164 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78806066164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81842358976).

78806066164 is an abundant number, since it is smaller than the sum of its proper divisors (84878651788).

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

78806066164 is a wasteful number, since it uses less digits than its factorization.

78806066164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21053 (or 21004 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 52.

The spelling of 78806066164 in words is "seventy-eight billion, eight hundred six million, sixty-six thousand, one hundred sixty-four".