666162216457 has 2 divisors, whose sum is σ = 666162216458. Its totient is φ = 666162216456.

The previous prime is 666162216439. The next prime is 666162216463. The reversal of 666162216457 is 754612261666.

It is a happy number.

666162216457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 455448167161 + 210714049296 = 674869^2 + 459036^2 .

It is a cyclic number.

It is not a de Polignac number, because 666162216457 - 2¹⁵ = 666162183689 is a prime.

It is not a weakly prime, because it can be changed into another prime (666162216407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333081108228 + 333081108229.

It is an arithmetic number, because the mean of its divisors is an integer number (333081108229).

Almost surely, 2^666162216457 is an apocalyptic number.

It is an amenable number.

666162216457 is a deficient number, since it is larger than the sum of its proper divisors (1).

666162216457 is an equidigital number, since it uses as much as digits as its factorization.

666162216457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 52.

The spelling of 666162216457 in words is "six hundred sixty-six billion, one hundred sixty-two million, two hundred sixteen thousand, four hundred fifty-seven".