664830768841 has 2 divisors, whose sum is σ = 664830768842. Its totient is φ = 664830768840.

The previous prime is 664830768793. The next prime is 664830768851. The reversal of 664830768841 is 148867038466.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 586419008400 + 78411760441 = 765780^2 + 280021^2 .

It is a cyclic number.

It is not a de Polignac number, because 664830768841 - 2⁷ = 664830768713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664830768841.

It is not a weakly prime, because it can be changed into another prime (664830768851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332415384420 + 332415384421.

It is an arithmetic number, because the mean of its divisors is an integer number (332415384421).

Almost surely, 2^664830768841 is an apocalyptic number.

It is an amenable number.

664830768841 is a deficient number, since it is larger than the sum of its proper divisors (1).

664830768841 is an equidigital number, since it uses as much as digits as its factorization.

664830768841 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37158912, while the sum is 61.

The spelling of 664830768841 in words is "six hundred sixty-four billion, eight hundred thirty million, seven hundred sixty-eight thousand, eight hundred forty-one".