166165162061 has 16 divisors (see below), whose sum is σ = 172228291200. Its totient is φ = 160212356928.

The previous prime is 166165161991. The next prime is 166165162063. The reversal of 166165162061 is 160261561661.

It is a cyclic number.

It is not a de Polignac number, because 166165162061 - 2²² = 166160967757 is a prime.

It is a super-2 number, since 2×166165162061² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166165162063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11590880 + ... + 11605206.

It is an arithmetic number, because the mean of its divisors is an integer number (10764268200).

Almost surely, 2^166165162061 is an apocalyptic number.

It is an amenable number.

166165162061 is a deficient number, since it is larger than the sum of its proper divisors (6063129139).

166165162061 is a wasteful number, since it uses less digits than its factorization.

166165162061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18148.

The product of its (nonzero) digits is 77760, while the sum is 41.

The spelling of 166165162061 in words is "one hundred sixty-six billion, one hundred sixty-five million, one hundred sixty-two thousand, sixty-one".