666463261 has 2 divisors, whose sum is σ = 666463262. Its totient is φ = 666463260.

The previous prime is 666463229. The next prime is 666463283. The reversal of 666463261 is 162364666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 659205625 + 7257636 = 25675^2 + 2694^2 .

It is a cyclic number.

It is not a de Polignac number, because 666463261 - 2⁵ = 666463229 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666463201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333231630 + 333231631.

It is an arithmetic number, because the mean of its divisors is an integer number (333231631).

Almost surely, 2^666463261 is an apocalyptic number.

It is an amenable number.

666463261 is a deficient number, since it is larger than the sum of its proper divisors (1).

666463261 is an equidigital number, since it uses as much as digits as its factorization.

666463261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 40.

The square root of 666463261 is about 25815.9497404221. The cubic root of 666463261 is about 873.4916100905.

The spelling of 666463261 in words is "six hundred sixty-six million, four hundred sixty-three thousand, two hundred sixty-one".