166611231 has 12 divisors (see below), whose sum is σ = 242007480. Its totient is φ = 110452560.

The previous prime is 166611223. The next prime is 166611233. The reversal of 166611231 is 132116661.

It is not a de Polignac number, because 166611231 - 2³ = 166611223 is a prime.

It is a super-2 number, since 2×166611231² = 55518604590670722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166611195 and 166611204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166611233) 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, 50100 + ... + 53321.

It is an arithmetic number, because the mean of its divisors is an integer number (20167290).

Almost surely, 2^166611231 is an apocalyptic number.

166611231 is a deficient number, since it is larger than the sum of its proper divisors (75396249).

166611231 is a wasteful number, since it uses less digits than its factorization.

166611231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103606 (or 103603 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 166611231 is about 12907.7972946588. The cubic root of 166611231 is about 550.2601865369.

Adding to 166611231 its reverse (132116661), we get a palindrome (298727892).

The spelling of 166611231 in words is "one hundred sixty-six million, six hundred eleven thousand, two hundred thirty-one".