166145599 has 2 divisors, whose sum is σ = 166145600. Its totient is φ = 166145598.

The previous prime is 166145569. The next prime is 166145627. The reversal of 166145599 is 995541661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166145599 - 2⁹ = 166145087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166145569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83072799 + 83072800.

It is an arithmetic number, because the mean of its divisors is an integer number (83072800).

Almost surely, 2^166145599 is an apocalyptic number.

166145599 is a deficient number, since it is larger than the sum of its proper divisors (1).

166145599 is an equidigital number, since it uses as much as digits as its factorization.

166145599 is an evil number, because the sum of its binary digits is even.

The product of its digits is 291600, while the sum is 46.

The square root of 166145599 is about 12889.7478253067. The cubic root of 166145599 is about 549.7471002590.

The spelling of 166145599 in words is "one hundred sixty-six million, one hundred forty-five thousand, five hundred ninety-nine".