166210061 has 4 divisors (see below), whose sum is σ = 166256412. Its totient is φ = 166163712.

The previous prime is 166210039. The next prime is 166210063. The reversal of 166210061 is 160012661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 115885225 + 50324836 = 10765^2 + 7094^2 .

It is a cyclic number.

It is not a de Polignac number, because 166210061 - 2¹⁰ = 166209037 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 (166210063) 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, 17300 + ... + 25133.

It is an arithmetic number, because the mean of its divisors is an integer number (41564103).

Almost surely, 2^166210061 is an apocalyptic number.

It is an amenable number.

166210061 is a deficient number, since it is larger than the sum of its proper divisors (46351).

166210061 is an equidigital number, since it uses as much as digits as its factorization.

166210061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46350.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 166210061 is about 12892.2480972094. The cubic root of 166210061 is about 549.8181889420.

The spelling of 166210061 in words is "one hundred sixty-six million, two hundred ten thousand, sixty-one".