205203199681 has 32 divisors (see below), whose sum is σ = 222239324160. Its totient is φ = 189026006400.

The previous prime is 205203199679. The next prime is 205203199711. The reversal of 205203199681 is 186991302502.

It is a cyclic number.

It is not a de Polignac number, because 205203199681 - 2¹ = 205203199679 is a prime.

It is a super-2 number, since 2×205203199681² (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 (205203199601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12054466 + ... + 12071476.

It is an arithmetic number, because the mean of its divisors is an integer number (6944978880).

Almost surely, 2^205203199681 is an apocalyptic number.

It is an amenable number.

205203199681 is a deficient number, since it is larger than the sum of its proper divisors (17036124479).

205203199681 is a wasteful number, since it uses less digits than its factorization.

205203199681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17277.

The product of its (nonzero) digits is 233280, while the sum is 46.

The spelling of 205203199681 in words is "two hundred five billion, two hundred three million, one hundred ninety-nine thousand, six hundred eighty-one".