666140159 has 2 divisors, whose sum is σ = 666140160. Its totient is φ = 666140158.

The previous prime is 666140143. The next prime is 666140177. The reversal of 666140159 is 951041666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666140159 - 2⁴ = 666140143 is a prime.

It is a super-2 number, since 2×666140159² = 887485422865090562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666140129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333070079 + 333070080.

It is an arithmetic number, because the mean of its divisors is an integer number (333070080).

Almost surely, 2^666140159 is an apocalyptic number.

666140159 is a deficient number, since it is larger than the sum of its proper divisors (1).

666140159 is an equidigital number, since it uses as much as digits as its factorization.

666140159 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 666140159 is about 25809.6911837395. The cubic root of 666140159 is about 873.3504307623.

The spelling of 666140159 in words is "six hundred sixty-six million, one hundred forty thousand, one hundred fifty-nine".