166651231 has 4 divisors (see below), whose sum is σ = 166805632. Its totient is φ = 166496832.

The previous prime is 166651217. The next prime is 166651241. The reversal of 166651231 is 132156661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166651231 - 2⁷ = 166651103 is a prime.

It is a super-2 number, since 2×166651231² = 55545265587630722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166651193 and 166651202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166651201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75570 + ... + 77743.

It is an arithmetic number, because the mean of its divisors is an integer number (41701408).

Almost surely, 2^166651231 is an apocalyptic number.

166651231 is a deficient number, since it is larger than the sum of its proper divisors (154401).

166651231 is a wasteful number, since it uses less digits than its factorization.

166651231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154400.

The product of its digits is 6480, while the sum is 31.

The square root of 166651231 is about 12909.3466527164. The cubic root of 166651231 is about 550.3042184751.

The spelling of 166651231 in words is "one hundred sixty-six million, six hundred fifty-one thousand, two hundred thirty-one".