660248591 has 2 divisors, whose sum is σ = 660248592. Its totient is φ = 660248590.

The previous prime is 660248581. The next prime is 660248593. The reversal of 660248591 is 195842066.

It is a happy number.

660248591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660248591 - 2²⁶ = 593139727 is a prime.

Together with 660248593, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660248593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330124295 + 330124296.

It is an arithmetic number, because the mean of its divisors is an integer number (330124296).

Almost surely, 2^660248591 is an apocalyptic number.

660248591 is a deficient number, since it is larger than the sum of its proper divisors (1).

660248591 is an equidigital number, since it uses as much as digits as its factorization.

660248591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 660248591 is about 25695.3028976115. The cubic root of 660248591 is about 870.7680674839.

The spelling of 660248591 in words is "six hundred sixty million, two hundred forty-eight thousand, five hundred ninety-one".