166615073 has 2 divisors, whose sum is σ = 166615074. Its totient is φ = 166615072.

The previous prime is 166615069. The next prime is 166615117. The reversal of 166615073 is 370516661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92775424 + 73839649 = 9632^2 + 8593^2 .

It is a cyclic number.

It is not a de Polignac number, because 166615073 - 2² = 166615069 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (166615003) by changing a digit.

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 as a sum of consecutive naturals, namely, 83307536 + 83307537.

It is an arithmetic number, because the mean of its divisors is an integer number (83307537).

Almost surely, 2^166615073 is an apocalyptic number.

It is an amenable number.

166615073 is a deficient number, since it is larger than the sum of its proper divisors (1).

166615073 is an equidigital number, since it uses as much as digits as its factorization.

166615073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 166615073 is about 12907.9461185736. The cubic root of 166615073 is about 550.2644161105.

The spelling of 166615073 in words is "one hundred sixty-six million, six hundred fifteen thousand, seventy-three".