166631233 has 2 divisors, whose sum is σ = 166631234. Its totient is φ = 166631232.

The previous prime is 166631219. The next prime is 166631261. The reversal of 166631233 is 332136661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144192064 + 22439169 = 12008^2 + 4737^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166631233 is a prime.

It is a super-2 number, since 2×166631233² = 55531935622200578, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166631195 and 166631204.

It is not a weakly prime, because it can be changed into another prime (166631833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83315616 + 83315617.

It is an arithmetic number, because the mean of its divisors is an integer number (83315617).

Almost surely, 2^166631233 is an apocalyptic number.

It is an amenable number.

166631233 is a deficient number, since it is larger than the sum of its proper divisors (1).

166631233 is an equidigital number, since it uses as much as digits as its factorization.

166631233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 31.

The square root of 166631233 is about 12908.5720744008. The cubic root of 166631233 is about 550.2822055885.

Adding to 166631233 its reverse (332136661), we get a palindrome (498767894).

The spelling of 166631233 in words is "one hundred sixty-six million, six hundred thirty-one thousand, two hundred thirty-three".