206440655331 has 24 divisors (see below), whose sum is σ = 290994541200. Its totient is φ = 130163295744.

The previous prime is 206440655299. The next prime is 206440655353. The reversal of 206440655331 is 133556044602.

It is not a de Polignac number, because 206440655331 - 2⁵ = 206440655299 is a prime.

It is a super-2 number, since 2×206440655331² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 206440655331.

It is not an unprimeable number, because it can be changed into a prime (206440655431) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 481495 + ... + 802943.

It is an arithmetic number, because the mean of its divisors is an integer number (12124772550).

Almost surely, 2^206440655331 is an apocalyptic number.

206440655331 is a deficient number, since it is larger than the sum of its proper divisors (84553885869).

206440655331 is a wasteful number, since it uses less digits than its factorization.

206440655331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322083 (or 322064 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 39.

Adding to 206440655331 its reverse (133556044602), we get a palindrome (339996699933).

The spelling of 206440655331 in words is "two hundred six billion, four hundred forty million, six hundred fifty-five thousand, three hundred thirty-one".