643591630160 has 20 divisors (see below), whose sum is σ = 1496350540308. Its totient is φ = 257436652032.

The previous prime is 643591630139. The next prime is 643591630183. The reversal of 643591630160 is 61036195346.

It can be written as a sum of positive squares in 2 ways, for example, as 138434596624 + 505157033536 = 372068^2 + 710744^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4022447609 + ... + 4022447768.

Almost surely, 2^643591630160 is an apocalyptic number.

It is an amenable number.

643591630160 is an abundant number, since it is smaller than the sum of its proper divisors (852758910148).

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

643591630160 is a wasteful number, since it uses less digits than its factorization.

643591630160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8044895390 (or 8044895384 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 44.

The spelling of 643591630160 in words is "six hundred forty-three billion, five hundred ninety-one million, six hundred thirty thousand, one hundred sixty".