166165101011656 has 16 divisors (see below), whose sum is σ = 329886597596940. Its totient is φ = 78195341652480.

The previous prime is 166165101011641. The next prime is 166165101011771. The reversal of 166165101011656 is 656110101561661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 143251359562756 + 22913741448900 = 11968766^2 + 4786830^2 .

It is a super-2 number, since 2×166165101011656² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 610901106525 + ... + 610901106796.

Almost surely, 2^{166165101011656} is an apocalyptic number.

It is an amenable number.

166165101011656 is a deficient number, since it is larger than the sum of its proper divisors (163721496585284).

166165101011656 is a wasteful number, since it uses less digits than its factorization.

166165101011656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221802213344 (or 1221802213340 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 46.

The spelling of 166165101011656 in words is "one hundred sixty-six trillion, one hundred sixty-five billion, one hundred one million, eleven thousand, six hundred fifty-six".