660785159 has 2 divisors, whose sum is σ = 660785160. Its totient is φ = 660785158.

The previous prime is 660785137. The next prime is 660785179. The reversal of 660785159 is 951587066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660785159 - 2²⁴ = 644007943 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660785179) 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, 330392579 + 330392580.

It is an arithmetic number, because the mean of its divisors is an integer number (330392580).

Almost surely, 2^660785159 is an apocalyptic number.

660785159 is a deficient number, since it is larger than the sum of its proper divisors (1).

660785159 is an equidigital number, since it uses as much as digits as its factorization.

660785159 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 453600, while the sum is 47.

The square root of 660785159 is about 25705.7417516009. The cubic root of 660785159 is about 871.0038876361.

The spelling of 660785159 in words is "six hundred sixty million, seven hundred eighty-five thousand, one hundred fifty-nine".