166641651 has 16 divisors (see below), whose sum is σ = 269320320. Its totient is φ = 100994760.

The previous prime is 166641623. The next prime is 166641677. The reversal of 166641651 is 156146661.

It is a happy number.

It is not a de Polignac number, because 166641651 - 2²⁶ = 99532787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166641611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 280245 + ... + 280838.

It is an arithmetic number, because the mean of its divisors is an integer number (16832520).

Almost surely, 2^166641651 is an apocalyptic number.

166641651 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

166641651 is a deficient number, since it is larger than the sum of its proper divisors (102678669).

166641651 is a wasteful number, since it uses less digits than its factorization.

166641651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561103 (or 561097 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 166641651 is about 12908.9755983966. The cubic root of 166641651 is about 550.2936734677.

The spelling of 166641651 in words is "one hundred sixty-six million, six hundred forty-one thousand, six hundred fifty-one".