166262661 has 12 divisors (see below), whose sum is σ = 240279520. Its totient is φ = 110785320.

The previous prime is 166262623. The next prime is 166262671.

It is a happy number.

166262661 is a `hidden beast` number, since 1 + 6 + 626 + 26 + 6 + 1 = 666.

166262661 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 166262661 - 2¹⁹ = 165738373 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 (166262671) 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, 21810 + ... + 28428.

Almost surely, 2^166262661 is an apocalyptic number.

It is an amenable number.

166262661 is a deficient number, since it is larger than the sum of its proper divisors (74016859).

166262661 is a wasteful number, since it uses less digits than its factorization.

166262661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9416 (or 9413 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 166262661 is about 12894.2879214015. The cubic root of 166262661 is about 549.8761825963.

The spelling of 166262661 in words is "one hundred sixty-six million, two hundred sixty-two thousand, six hundred sixty-one".