166566607055 has 4 divisors (see below), whose sum is σ = 199879928472. Its totient is φ = 133253285640.

The previous prime is 166566607043. The next prime is 166566607069. The reversal of 166566607055 is 550706665661.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 166566607055 - 2⁸ = 166566606799 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166566606988 and 166566607006.

It is a congruent number.

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, 16656660701 + ... + 16656660710.

It is an arithmetic number, because the mean of its divisors is an integer number (49969982118).

Almost surely, 2^166566607055 is an apocalyptic number.

166566607055 is a deficient number, since it is larger than the sum of its proper divisors (33313321417).

166566607055 is an equidigital number, since it uses as much as digits as its factorization.

166566607055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33313321416.

The product of its (nonzero) digits is 6804000, while the sum is 53.

The spelling of 166566607055 in words is "one hundred sixty-six billion, five hundred sixty-six million, six hundred seven thousand, fifty-five".