660251227 has 2 divisors, whose sum is σ = 660251228. Its totient is φ = 660251226.

The previous prime is 660251209. The next prime is 660251231. The reversal of 660251227 is 722152066.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660251227 is a prime.

It is not a weakly prime, because it can be changed into another prime (660251027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330125613 + 330125614.

It is an arithmetic number, because the mean of its divisors is an integer number (330125614).

Almost surely, 2^660251227 is an apocalyptic number.

660251227 is a deficient number, since it is larger than the sum of its proper divisors (1).

660251227 is an equidigital number, since it uses as much as digits as its factorization.

660251227 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 660251227 is about 25695.3541909817. The cubic root of 660251227 is about 870.7692263108.

The spelling of 660251227 in words is "six hundred sixty million, two hundred fifty-one thousand, two hundred twenty-seven".