166680018015156 has 36 divisors (see below), whose sum is σ = 446114165865732. Its totient is φ = 52291770357504.

The previous prime is 166680018015151. The next prime is 166680018015163. The reversal of 166680018015156 is 651510810086661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 125854742250000 + 40825275765156 = 11218500^2 + 6389466^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166680018015151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 136176484695 + ... + 136176485918.

It is an arithmetic number, because the mean of its divisors is an integer number (12392060162937).

Almost surely, 2^{166680018015156} is an apocalyptic number.

It is an amenable number.

166680018015156 is an abundant number, since it is smaller than the sum of its proper divisors (279434147850576).

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

166680018015156 is a wasteful number, since it uses less digits than its factorization.

166680018015156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272352970640 (or 272352970635 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 54.

The spelling of 166680018015156 in words is "one hundred sixty-six trillion, six hundred eighty billion, eighteen million, fifteen thousand, one hundred fifty-six".