660436289 has 2 divisors, whose sum is σ = 660436290. Its totient is φ = 660436288.

The previous prime is 660436253. The next prime is 660436321. The reversal of 660436289 is 982634066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 657050689 + 3385600 = 25633^2 + 1840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660436289 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (660436489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330218144 + 330218145.

It is an arithmetic number, because the mean of its divisors is an integer number (330218145).

Almost surely, 2^660436289 is an apocalyptic number.

It is an amenable number.

660436289 is a deficient number, since it is larger than the sum of its proper divisors (1).

660436289 is an equidigital number, since it uses as much as digits as its factorization.

660436289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 44.

The square root of 660436289 is about 25698.9550176656. The cubic root of 660436289 is about 870.8505747605.

The spelling of 660436289 in words is "six hundred sixty million, four hundred thirty-six thousand, two hundred eighty-nine".