243629841681 has 24 divisors (see below), whose sum is σ = 363572401920. Its totient is φ = 157046104800.

The previous prime is 243629841661. The next prime is 243629841683. The reversal of 243629841681 is 186148926342.

243629841681 is a `hidden beast` number, since 2 + 4 + 3 + 62 + 98 + 416 + 81 = 666.

243629841681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 243629841681 - 2⁵ = 243629841649 is a prime.

It is a super-2 number, since 2×243629841681² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (243629841683) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 46146 + ... + 699563.

It is an arithmetic number, because the mean of its divisors is an integer number (15148850080).

Almost surely, 2^243629841681 is an apocalyptic number.

It is an amenable number.

243629841681 is a deficient number, since it is larger than the sum of its proper divisors (119942560239).

243629841681 is a wasteful number, since it uses less digits than its factorization.

243629841681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746917 (or 746914 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 54.

The spelling of 243629841681 in words is "two hundred forty-three billion, six hundred twenty-nine million, eight hundred forty-one thousand, six hundred eighty-one".