6641760661201 has 2 divisors, whose sum is σ = 6641760661202. Its totient is φ = 6641760661200.

The previous prime is 6641760661171. The next prime is 6641760661243. The reversal of 6641760661201 is 1021660671466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4162726156176 + 2479034505025 = 2040276^2 + 1574495^2 .

It is a cyclic number.

It is not a de Polignac number, because 6641760661201 - 2⁷ = 6641760661073 is a prime.

It is a super-2 number, since 2×6641760661201² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6641760668201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3320880330600 + 3320880330601.

It is an arithmetic number, because the mean of its divisors is an integer number (3320880330601).

Almost surely, 2^{6641760661201} is an apocalyptic number.

It is an amenable number.

6641760661201 is a deficient number, since it is larger than the sum of its proper divisors (1).

6641760661201 is an equidigital number, since it uses as much as digits as its factorization.

6641760661201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 46.

The spelling of 6641760661201 in words is "six trillion, six hundred forty-one billion, seven hundred sixty million, six hundred sixty-one thousand, two hundred one".