166575006621 has 12 divisors (see below), whose sum is σ = 241123570272. Its totient is φ = 110812207176.

The previous prime is 166575006557. The next prime is 166575006649. The reversal of 166575006621 is 126600575661.

166575006621 is a `hidden beast` number, since 1 + 6 + 65 + 7 + 500 + 66 + 21 = 666.

166575006621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166575006621 - 2⁶ = 166575006557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166575006691) 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 11 ways as a sum of consecutive naturals, for example, 19812001 + ... + 19820406.

It is an arithmetic number, because the mean of its divisors is an integer number (20093630856).

Almost surely, 2^166575006621 is an apocalyptic number.

It is an amenable number.

166575006621 is a deficient number, since it is larger than the sum of its proper divisors (74548563651).

166575006621 is a wasteful number, since it uses less digits than its factorization.

166575006621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39632880 (or 39632877 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The spelling of 166575006621 in words is "one hundred sixty-six billion, five hundred seventy-five million, six thousand, six hundred twenty-one".