646454600663 has 2 divisors, whose sum is σ = 646454600664. Its totient is φ = 646454600662.

The previous prime is 646454600633. The next prime is 646454600681. The reversal of 646454600663 is 366006454646.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 646454600663 - 2³⁴ = 629274731479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646454600633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323227300331 + 323227300332.

It is an arithmetic number, because the mean of its divisors is an integer number (323227300332).

Almost surely, 2^646454600663 is an apocalyptic number.

646454600663 is a deficient number, since it is larger than the sum of its proper divisors (1).

646454600663 is an equidigital number, since it uses as much as digits as its factorization.

646454600663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7464960, while the sum is 50.

The spelling of 646454600663 in words is "six hundred forty-six billion, four hundred fifty-four million, six hundred thousand, six hundred sixty-three".