666565163 has 12 divisors (see below), whose sum is σ = 771235080. Its totient is φ = 574073280.

The previous prime is 666565127. The next prime is 666565169. The reversal of 666565163 is 361565666.

It is not a de Polignac number, because 666565163 - 2⁶ = 666565099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666565169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142670 + ... + 147267.

It is an arithmetic number, because the mean of its divisors is an integer number (64269590).

Almost surely, 2^666565163 is an apocalyptic number.

666565163 is a deficient number, since it is larger than the sum of its proper divisors (104669917).

666565163 is a wasteful number, since it uses less digits than its factorization.

666565163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289978 (or 289967 counting only the distinct ones).

The product of its digits is 583200, while the sum is 44.

The square root of 666565163 is about 25817.9232898388. The cubic root of 666565163 is about 873.5361266758.

The spelling of 666565163 in words is "six hundred sixty-six million, five hundred sixty-five thousand, one hundred sixty-three".