166605500601 has 6 divisors (see below), whose sum is σ = 240652389770. Its totient is φ = 111070333728.

The previous prime is 166605500587. The next prime is 166605500693. The reversal of 166605500601 is 106005506661.

166605500601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 155138303376 + 11467197225 = 393876^2 + 107085^2 .

It is a de Polignac number, because none of the positive numbers 2^k-166605500601 is a prime.

It is a super-2 number, since 2×166605500601² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166607500601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9255861136 + ... + 9255861153.

Almost surely, 2^166605500601 is an apocalyptic number.

It is an amenable number.

166605500601 is a deficient number, since it is larger than the sum of its proper divisors (74046889169).

166605500601 is a wasteful number, since it uses less digits than its factorization.

166605500601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18511722295 (or 18511722292 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 166605500601 in words is "one hundred sixty-six billion, six hundred five million, five hundred thousand, six hundred one".