166101661 has 12 divisors (see below), whose sum is σ = 183803872. Its totient is φ = 149985000.

The previous prime is 166101641. The next prime is 166101673.

166101661 is nontrivially palindromic in base 10.

166101661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166101661 - 2¹¹ = 166099613 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166101641) 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, 13726 + ... + 22816.

Almost surely, 2^166101661 is an apocalyptic number.

166101661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166101661 is a deficient number, since it is larger than the sum of its proper divisors (17702211).

166101661 is a wasteful number, since it uses less digits than its factorization.

166101661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9264 (or 9253 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 166101661 is about 12888.0433348123. The cubic root of 166101661 is about 549.6986349012.

The spelling of 166101661 in words is "one hundred sixty-six million, one hundred one thousand, six hundred sixty-one".