166281233 has 4 divisors (see below), whose sum is σ = 176062500. Its totient is φ = 156499968.

The previous prime is 166281229. The next prime is 166281239. The reversal of 166281233 is 332182661.

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

It can be written as a sum of positive squares in 2 ways, for example, as 138697729 + 27583504 = 11777^2 + 5252^2 .

It is a cyclic number.

It is not a de Polignac number, because 166281233 - 2² = 166281229 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 166281233.

It is not an unprimeable number, because it can be changed into a prime (166281239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4890608 + ... + 4890641.

It is an arithmetic number, because the mean of its divisors is an integer number (44015625).

Almost surely, 2^166281233 is an apocalyptic number.

It is an amenable number.

166281233 is a deficient number, since it is larger than the sum of its proper divisors (9781267).

166281233 is an equidigital number, since it uses as much as digits as its factorization.

166281233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9781266.

The product of its digits is 10368, while the sum is 32.

The square root of 166281233 is about 12895.0080651390. The cubic root of 166281233 is about 549.8966560652.

The spelling of 166281233 in words is "one hundred sixty-six million, two hundred eighty-one thousand, two hundred thirty-three".