666580741633 has 2 divisors, whose sum is σ = 666580741634. Its totient is φ = 666580741632.

The previous prime is 666580741627. The next prime is 666580741661. The reversal of 666580741633 is 336147085666.

666580741633 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 542118546369 + 124462195264 = 736287^2 + 352792^2 .

It is a cyclic number.

It is not a de Polignac number, because 666580741633 - 2⁹ = 666580741121 is a prime.

It is not a weakly prime, because it can be changed into another prime (666580741133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333290370816 + 333290370817.

It is an arithmetic number, because the mean of its divisors is an integer number (333290370817).

Almost surely, 2^666580741633 is an apocalyptic number.

It is an amenable number.

666580741633 is a deficient number, since it is larger than the sum of its proper divisors (1).

666580741633 is an equidigital number, since it uses as much as digits as its factorization.

666580741633 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13063680, while the sum is 55.

The spelling of 666580741633 in words is "six hundred sixty-six billion, five hundred eighty million, seven hundred forty-one thousand, six hundred thirty-three".