660575644987 has 2 divisors, whose sum is σ = 660575644988. Its totient is φ = 660575644986.

The previous prime is 660575644969. The next prime is 660575644999. The reversal of 660575644987 is 789446575066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660575644987 - 2²³ = 660567256379 is a prime.

It is not a weakly prime, because it can be changed into another prime (660575644907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330287822493 + 330287822494.

It is an arithmetic number, because the mean of its divisors is an integer number (330287822494).

Almost surely, 2^660575644987 is an apocalyptic number.

660575644987 is a deficient number, since it is larger than the sum of its proper divisors (1).

660575644987 is an equidigital number, since it uses as much as digits as its factorization.

660575644987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 304819200, while the sum is 67.

The spelling of 660575644987 in words is "six hundred sixty billion, five hundred seventy-five million, six hundred forty-four thousand, nine hundred eighty-seven".