643082772042 has 20 divisors (see below), whose sum is σ = 1440981767346. Its totient is φ = 214360923960.

The previous prime is 643082772041. The next prime is 643082772047. The reversal of 643082772042 is 240277280346.

643082772042 is a `hidden beast` number, since 6 + 430 + 8 + 2 + 7 + 7 + 204 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 633136898601 + 9945873441 = 795699^2 + 99729^2 .

It is not an unprimeable number, because it can be changed into a prime (643082772041) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1984823209 + ... + 1984823532.

Almost surely, 2^643082772042 is an apocalyptic number.

643082772042 is an abundant number, since it is smaller than the sum of its proper divisors (797898995304).

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

643082772042 is a wasteful number, since it uses less digits than its factorization.

643082772042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3969646755 (or 3969646746 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 45.

The spelling of 643082772042 in words is "six hundred forty-three billion, eighty-two million, seven hundred seventy-two thousand, forty-two".