166815073 has 2 divisors, whose sum is σ = 166815074. Its totient is φ = 166815072.

The previous prime is 166815043. The next prime is 166815083. The reversal of 166815073 is 370518661.

166815073 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150111504 + 16703569 = 12252^2 + 4087^2 .

It is a cyclic number.

It is not a de Polignac number, because 166815073 - 2¹³ = 166806881 is a prime.

It is not a weakly prime, because it can be changed into another prime (166815013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83407536 + 83407537.

It is an arithmetic number, because the mean of its divisors is an integer number (83407537).

Almost surely, 2^166815073 is an apocalyptic number.

It is an amenable number.

166815073 is a deficient number, since it is larger than the sum of its proper divisors (1).

166815073 is an equidigital number, since it uses as much as digits as its factorization.

166815073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 166815073 is about 12915.6909609978. The cubic root of 166815073 is about 550.4845019963.

The spelling of 166815073 in words is "one hundred sixty-six million, eight hundred fifteen thousand, seventy-three".