643226702140 has 24 divisors (see below), whose sum is σ = 1473573899952. Its totient is φ = 233900618880.

The previous prime is 643226702137. The next prime is 643226702141. The reversal of 643226702140 is 41207622346.

It is a self number, because there is not a number n which added to its sum of digits gives 643226702140.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643226702141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1461878649 + ... + 1461879088.

It is an arithmetic number, because the mean of its divisors is an integer number (61398912498).

Almost surely, 2^643226702140 is an apocalyptic number.

It is an amenable number.

643226702140 is an abundant number, since it is smaller than the sum of its proper divisors (830347197812).

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

643226702140 is a wasteful number, since it uses less digits than its factorization.

643226702140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2923757757 (or 2923757755 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 37.

The spelling of 643226702140 in words is "six hundred forty-three billion, two hundred twenty-six million, seven hundred two thousand, one hundred forty".