166189907 has 4 divisors (see below), whose sum is σ = 178973760. Its totient is φ = 153406056.

The previous prime is 166189879. The next prime is 166189921. The reversal of 166189907 is 709981661.

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

It is a cyclic number.

It is not a de Polignac number, because 166189907 - 2¹⁴ = 166173523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166089907) 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, 6391907 + ... + 6391932.

It is an arithmetic number, because the mean of its divisors is an integer number (44743440).

Almost surely, 2^166189907 is an apocalyptic number.

166189907 is a deficient number, since it is larger than the sum of its proper divisors (12783853).

166189907 is a wasteful number, since it uses less digits than its factorization.

166189907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12783852.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 166189907 is about 12891.4664410221. The cubic root of 166189907 is about 549.7959650894.

The spelling of 166189907 in words is "one hundred sixty-six million, one hundred eighty-nine thousand, nine hundred seven".