200639827681 has 4 divisors (see below), whose sum is σ = 200900738500. Its totient is φ = 200378916864.

The previous prime is 200639827679. The next prime is 200639827691. The reversal of 200639827681 is 186728936002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 157493891025 + 43145936656 = 396855^2 + 207716^2 .

It is a cyclic number.

It is not a de Polignac number, because 200639827681 - 2¹ = 200639827679 is a prime.

It is a super-2 number, since 2×200639827681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (200639827621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130454256 + ... + 130455793.

It is an arithmetic number, because the mean of its divisors is an integer number (50225184625).

Almost surely, 2^200639827681 is an apocalyptic number.

It is an amenable number.

200639827681 is a deficient number, since it is larger than the sum of its proper divisors (260910819).

200639827681 is an equidigital number, since it uses as much as digits as its factorization.

200639827681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260910818.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 200639827681 in words is "two hundred billion, six hundred thirty-nine million, eight hundred twenty-seven thousand, six hundred eighty-one".