166405465 has 16 divisors (see below), whose sum is σ = 205615872. Its totient is φ = 129190464.

The previous prime is 166405453. The next prime is 166405487. The reversal of 166405465 is 564504661.

It is a cyclic number.

It is not a de Polignac number, because 166405465 - 2²⁷ = 32187737 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89172 + ... + 91018.

It is an arithmetic number, because the mean of its divisors is an integer number (12850992).

Almost surely, 2^166405465 is an apocalyptic number.

It is an amenable number.

166405465 is a deficient number, since it is larger than the sum of its proper divisors (39210407).

166405465 is a wasteful number, since it uses less digits than its factorization.

166405465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2376.

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 166405465 is about 12899.8242236086. The cubic root of 166405465 is about 550.0335681991.

The spelling of 166405465 in words is "one hundred sixty-six million, four hundred five thousand, four hundred sixty-five".