166533665 has 8 divisors (see below), whose sum is σ = 200086440. Its totient is φ = 133062912.

The previous prime is 166533629. The next prime is 166533671. The reversal of 166533665 is 566335661.

It can be written as a sum of positive squares in 4 ways, for example, as 58186384 + 108347281 = 7628^2 + 10409^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166533665 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15944 + ... + 24233.

It is an arithmetic number, because the mean of its divisors is an integer number (25010805).

Almost surely, 2^166533665 is an apocalyptic number.

It is an amenable number.

166533665 is a deficient number, since it is larger than the sum of its proper divisors (33552775).

166533665 is an equidigital number, since it uses as much as digits as its factorization.

166533665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41011.

The product of its digits is 291600, while the sum is 41.

The square root of 166533665 is about 12904.7923268838. The cubic root of 166533665 is about 550.1747819166.

The spelling of 166533665 in words is "one hundred sixty-six million, five hundred thirty-three thousand, six hundred sixty-five".