166064689 has 4 divisors (see below), whose sum is σ = 189788224. Its totient is φ = 142341156.

The previous prime is 166064671. The next prime is 166064699. The reversal of 166064689 is 986460661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 986460661 = 811 ⋅1216351.

It is a cyclic number.

It is not a de Polignac number, because 166064689 - 2²³ = 157676081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166064699) 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, 11861757 + ... + 11861770.

It is an arithmetic number, because the mean of its divisors is an integer number (47447056).

Almost surely, 2^166064689 is an apocalyptic number.

It is an amenable number.

166064689 is a deficient number, since it is larger than the sum of its proper divisors (23723535).

166064689 is an equidigital number, since it uses as much as digits as its factorization.

166064689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23723534.

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 166064689 is about 12886.6089022675. The cubic root of 166064689 is about 549.6578466958.

It can be divided in two parts, 166064 and 689, that added together give a triangular number (166753 = T₅₇₇).

The spelling of 166064689 in words is "one hundred sixty-six million, sixty-four thousand, six hundred eighty-nine".