166663231 has 24 divisors (see below), whose sum is σ = 203325984. Its totient is φ = 133790400.

The previous prime is 166663229. The next prime is 166663279. The reversal of 166663231 is 132366661.

It is not a de Polignac number, because 166663231 - 2¹ = 166663229 is a prime.

It is a super-2 number, since 2×166663231² = 55553265134718722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166663331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 254901 + ... + 255553.

It is an arithmetic number, because the mean of its divisors is an integer number (8471916).

Almost surely, 2^166663231 is an apocalyptic number.

166663231 is a deficient number, since it is larger than the sum of its proper divisors (36662753).

166663231 is a wasteful number, since it uses less digits than its factorization.

166663231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799 (or 780 counting only the distinct ones).

The product of its digits is 23328, while the sum is 34.

The square root of 166663231 is about 12909.8114238745. The cubic root of 166663231 is about 550.3174266827.

The spelling of 166663231 in words is "one hundred sixty-six million, six hundred sixty-three thousand, two hundred thirty-one".