666455413767193 has 2 divisors, whose sum is σ = 666455413767194. Its totient is φ = 666455413767192.

The previous prime is 666455413767181. The next prime is 666455413767211. The reversal of 666455413767193 is 391767314554666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 664145111046169 + 2310302721024 = 25771013^2 + 1519968^2 .

It is a cyclic number.

It is not a de Polignac number, because 666455413767193 - 2¹⁷ = 666455413636121 is a prime.

It is not a weakly prime, because it can be changed into another prime (666455413767163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333227706883596 + 333227706883597.

It is an arithmetic number, because the mean of its divisors is an integer number (333227706883597).

Almost surely, 2^{666455413767193} is an apocalyptic number.

It is an amenable number.

666455413767193 is a deficient number, since it is larger than the sum of its proper divisors (1).

666455413767193 is an equidigital number, since it uses as much as digits as its factorization.

666455413767193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2057529600, while the sum is 73.

The spelling of 666455413767193 in words is "six hundred sixty-six trillion, four hundred fifty-five billion, four hundred thirteen million, seven hundred sixty-seven thousand, one hundred ninety-three".