646544463 has 12 divisors (see below), whose sum is σ = 890768664. Its totient is φ = 417123600.

The previous prime is 646544447. The next prime is 646544491. The reversal of 646544463 is 364445646.

It is not a de Polignac number, because 646544463 - 2⁴ = 646544447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646544413) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109248 + ... + 115013.

It is an arithmetic number, because the mean of its divisors is an integer number (74230722).

Almost surely, 2^646544463 is an apocalyptic number.

646544463 is a deficient number, since it is larger than the sum of its proper divisors (244224201).

646544463 is a wasteful number, since it uses less digits than its factorization.

646544463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224326 (or 224295 counting only the distinct ones).

The product of its digits is 829440, while the sum is 42.

The square root of 646544463 is about 25427.2386035134. The cubic root of 646544463 is about 864.7013405322.

The spelling of 646544463 in words is "six hundred forty-six million, five hundred forty-four thousand, four hundred sixty-three".