643464063 has 12 divisors (see below), whose sum is σ = 1013943528. Its totient is φ = 389978160.

The previous prime is 643464011. The next prime is 643464067. The reversal of 643464063 is 360464346.

643464063 is a `hidden beast` number, since 6 + 4 + 3 + 4 + 640 + 6 + 3 = 666.

It is not a de Polignac number, because 643464063 - 2¹² = 643459967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643464067) 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, 3249720 + ... + 3249917.

It is an arithmetic number, because the mean of its divisors is an integer number (84495294).

Almost surely, 2^643464063 is an apocalyptic number.

643464063 is a deficient number, since it is larger than the sum of its proper divisors (370479465).

643464063 is a wasteful number, since it uses less digits than its factorization.

643464063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6499654 (or 6499651 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 36.

The square root of 643464063 is about 25366.5934449228. The cubic root of 643464063 is about 863.3258912049.

The spelling of 643464063 in words is "six hundred forty-three million, four hundred sixty-four thousand, sixty-three".