166564127 has 4 divisors (see below), whose sum is σ = 175330680. Its totient is φ = 157797576.

The previous prime is 166564103. The next prime is 166564141. The reversal of 166564127 is 721465661.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166564127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166564157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4383248 + ... + 4383285.

It is an arithmetic number, because the mean of its divisors is an integer number (43832670).

Almost surely, 2^166564127 is an apocalyptic number.

166564127 is a deficient number, since it is larger than the sum of its proper divisors (8766553).

166564127 is an equidigital number, since it uses as much as digits as its factorization.

166564127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8766552.

The product of its digits is 60480, while the sum is 38.

The square root of 166564127 is about 12905.9725321264. The cubic root of 166564127 is about 550.2083254896.

The spelling of 166564127 in words is "one hundred sixty-six million, five hundred sixty-four thousand, one hundred twenty-seven".