166265963 has 2 divisors, whose sum is σ = 166265964. Its totient is φ = 166265962.

The previous prime is 166265959. The next prime is 166266097. The reversal of 166265963 is 369562661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166265963 - 2² = 166265959 is a prime.

It is not a weakly prime, because it can be changed into another prime (166265063) 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, 83132981 + 83132982.

It is an arithmetic number, because the mean of its divisors is an integer number (83132982).

Almost surely, 2^166265963 is an apocalyptic number.

166265963 is a deficient number, since it is larger than the sum of its proper divisors (1).

166265963 is an equidigital number, since it uses as much as digits as its factorization.

166265963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 44.

The square root of 166265963 is about 12894.4159619581. The cubic root of 166265963 is about 549.8798227785.

The spelling of 166265963 in words is "one hundred sixty-six million, two hundred sixty-five thousand, nine hundred sixty-three".