166141661 has 12 divisors (see below), whose sum is σ = 192360672. Its totient is φ = 140567544.

The previous prime is 166141589. The next prime is 166141687.

166141661 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 166141661 - 2¹⁴ = 166125277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166141691) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41786 + ... + 45588.

It is an arithmetic number, because the mean of its divisors is an integer number (16030056).

Almost surely, 2^166141661 is an apocalyptic number.

It is an amenable number.

166141661 is a deficient number, since it is larger than the sum of its proper divisors (26219011).

166141661 is an frugal number, since it uses more digits than its factorization.

166141661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3968 (or 3889 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 166141661 is about 12889.5950673402. The cubic root of 166141661 is about 549.7427568373.

The spelling of 166141661 in words is "one hundred sixty-six million, one hundred forty-one thousand, six hundred sixty-one".