166607965 has 4 divisors (see below), whose sum is σ = 199929564. Its totient is φ = 133286368.

The previous prime is 166607957. The next prime is 166607971. The reversal of 166607965 is 569706661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 569706661 = 23719 ⋅24019.

It can be written as a sum of positive squares in 2 ways, for example, as 38601369 + 128006596 = 6213^2 + 11314^2 .

It is a cyclic number.

It is not a de Polignac number, because 166607965 - 2³ = 166607957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16660792 + ... + 16660801.

It is an arithmetic number, because the mean of its divisors is an integer number (49982391).

Almost surely, 2^166607965 is an apocalyptic number.

It is an amenable number.

166607965 is a deficient number, since it is larger than the sum of its proper divisors (33321599).

166607965 is an equidigital number, since it uses as much as digits as its factorization.

166607965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33321598.

The product of its (nonzero) digits is 408240, while the sum is 46.

The square root of 166607965 is about 12907.6707813610. The cubic root of 166607965 is about 550.2565910180.

The spelling of 166607965 in words is "one hundred sixty-six million, six hundred seven thousand, nine hundred sixty-five".