643120274211 has 16 divisors (see below), whose sum is σ = 859005058560. Its totient is φ = 427991355360.

The previous prime is 643120274179. The next prime is 643120274213. The reversal of 643120274211 is 112472021346.

It is not a de Polignac number, because 643120274211 - 2⁵ = 643120274179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643120274213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17781616 + ... + 17817746.

It is an arithmetic number, because the mean of its divisors is an integer number (53687816160).

Almost surely, 2^643120274211 is an apocalyptic number.

643120274211 is a deficient number, since it is larger than the sum of its proper divisors (215884784349).

643120274211 is a wasteful number, since it uses less digits than its factorization.

643120274211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46426.

The product of its (nonzero) digits is 16128, while the sum is 33.

Adding to 643120274211 its reverse (112472021346), we get a palindrome (755592295557).

The spelling of 643120274211 in words is "six hundred forty-three billion, one hundred twenty million, two hundred seventy-four thousand, two hundred eleven".