166605701 has 4 divisors (see below), whose sum is σ = 169337004. Its totient is φ = 163874400.

The previous prime is 166605697. The next prime is 166605727. The reversal of 166605701 is 107506661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 107506661 = 6761 ⋅15901.

It can be written as a sum of positive squares in 2 ways, for example, as 31348801 + 135256900 = 5599^2 + 11630^2 .

It is a cyclic number.

It is not a de Polignac number, because 166605701 - 2² = 166605697 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166605781) 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, 1365560 + ... + 1365681.

It is an arithmetic number, because the mean of its divisors is an integer number (42334251).

Almost surely, 2^166605701 is an apocalyptic number.

It is an amenable number.

166605701 is a deficient number, since it is larger than the sum of its proper divisors (2731303).

166605701 is an equidigital number, since it uses as much as digits as its factorization.

166605701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2731302.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 166605701 is about 12907.5830812744. The cubic root of 166605701 is about 550.2540985670.

The spelling of 166605701 in words is "one hundred sixty-six million, six hundred five thousand, seven hundred one".