666462501671 has 2 divisors, whose sum is σ = 666462501672. Its totient is φ = 666462501670.

The previous prime is 666462501667. The next prime is 666462501709. The reversal of 666462501671 is 176105264666.

666462501671 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 is a cyclic number.

It is not a de Polignac number, because 666462501671 - 2² = 666462501667 is a prime.

It is a super-2 number, since 2×666462501671² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666462501071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333231250835 + 333231250836.

It is an arithmetic number, because the mean of its divisors is an integer number (333231250836).

Almost surely, 2^666462501671 is an apocalyptic number.

666462501671 is a deficient number, since it is larger than the sum of its proper divisors (1).

666462501671 is an equidigital number, since it uses as much as digits as its factorization.

666462501671 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2177280, while the sum is 50.

The spelling of 666462501671 in words is "six hundred sixty-six billion, four hundred sixty-two million, five hundred one thousand, six hundred seventy-one".