166440233 has 2 divisors, whose sum is σ = 166440234. Its totient is φ = 166440232.

The previous prime is 166440199. The next prime is 166440257. The reversal of 166440233 is 332044661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83411689 + 83028544 = 9133^2 + 9112^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166440233 is a prime.

It is a super-2 number, since 2×166440233² = 55404702322188578, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166440196 and 166440205.

It is not a weakly prime, because it can be changed into another prime (166440283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83220116 + 83220117.

It is an arithmetic number, because the mean of its divisors is an integer number (83220117).

Almost surely, 2^166440233 is an apocalyptic number.

It is an amenable number.

166440233 is a deficient number, since it is larger than the sum of its proper divisors (1).

166440233 is an equidigital number, since it uses as much as digits as its factorization.

166440233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 166440233 is about 12901.1717684868. The cubic root of 166440233 is about 550.0718727011.

Adding to 166440233 its reverse (332044661), we get a palindrome (498484894).

The spelling of 166440233 in words is "one hundred sixty-six million, four hundred forty thousand, two hundred thirty-three".