166560909 has 8 divisors (see below), whose sum is σ = 222212640. Its totient is φ = 110974896.

The previous prime is 166560907. The next prime is 166560913. The reversal of 166560909 is 909065661.

166560909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166560909 - 2¹ = 166560907 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166560907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10174 + ... + 20895.

It is an arithmetic number, because the mean of its divisors is an integer number (27776580).

Almost surely, 2^166560909 is an apocalyptic number.

It is an amenable number.

166560909 is a deficient number, since it is larger than the sum of its proper divisors (55651731).

166560909 is a wasteful number, since it uses less digits than its factorization.

166560909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32859.

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 166560909 is about 12905.8478605631. The cubic root of 166560909 is about 550.2047821460.

The spelling of 166560909 in words is "one hundred sixty-six million, five hundred sixty thousand, nine hundred nine".