166231265 has 4 divisors (see below), whose sum is σ = 199477524. Its totient is φ = 132985008.

The previous prime is 166231259. The next prime is 166231297. The reversal of 166231265 is 562132661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 562132661 = 3517 ⋅159833.

It can be written as a sum of positive squares in 2 ways, for example, as 48052624 + 118178641 = 6932^2 + 10871^2 .

It is a cyclic number.

It is not a de Polignac number, because 166231265 - 2⁶ = 166231201 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16623122 + ... + 16623131.

It is an arithmetic number, because the mean of its divisors is an integer number (49869381).

Almost surely, 2^166231265 is an apocalyptic number.

It is an amenable number.

166231265 is a deficient number, since it is larger than the sum of its proper divisors (33246259).

166231265 is an equidigital number, since it uses as much as digits as its factorization.

166231265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33246258.

The product of its digits is 12960, while the sum is 32.

The square root of 166231265 is about 12893.0704256201. The cubic root of 166231265 is about 549.8415686922.

The spelling of 166231265 in words is "one hundred sixty-six million, two hundred thirty-one thousand, two hundred sixty-five".