660680751553 has 2 divisors, whose sum is σ = 660680751554. Its totient is φ = 660680751552.

The previous prime is 660680751509. The next prime is 660680751589. The reversal of 660680751553 is 355157086066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 405753712144 + 254927039409 = 636988^2 + 504903^2 .

It is a cyclic number.

It is not a de Polignac number, because 660680751553 - 2³⁷ = 523241798081 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 660680751553.

It is not a weakly prime, because it can be changed into another prime (660680751053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330340375776 + 330340375777.

It is an arithmetic number, because the mean of its divisors is an integer number (330340375777).

Almost surely, 2^660680751553 is an apocalyptic number.

It is an amenable number.

660680751553 is a deficient number, since it is larger than the sum of its proper divisors (1).

660680751553 is an equidigital number, since it uses as much as digits as its factorization.

660680751553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536000, while the sum is 52.

The spelling of 660680751553 in words is "six hundred sixty billion, six hundred eighty million, seven hundred fifty-one thousand, five hundred fifty-three".