643533056334630 has 144 divisors (see below), whose sum is σ = 2101853420608032. Its totient is φ = 133721154547200.

The previous prime is 643533056334613. The next prime is 643533056334703. The reversal of 643533056334630 is 36433650335346.

643533056334630 is a `hidden beast` number, since 6 + 4 + 3 + 5 + 3 + 3 + 0 + 563 + 3 + 46 + 30 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4220919811 + ... + 4221072270.

It is an arithmetic number, because the mean of its divisors is an integer number (14596204309778).

Almost surely, 2^{643533056334630} is an apocalyptic number.

643533056334630 is an abundant number, since it is smaller than the sum of its proper divisors (1458320364273402).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643533056334630 is a wasteful number, since it uses less digits than its factorization.

643533056334630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8441992123 (or 8441992109 counting only the distinct ones).

The product of its (nonzero) digits is 62985600, while the sum is 54.

The spelling of 643533056334630 in words is "six hundred forty-three trillion, five hundred thirty-three billion, fifty-six million, three hundred thirty-four thousand, six hundred thirty".