206440655539 has 2 divisors, whose sum is σ = 206440655540. Its totient is φ = 206440655538.

The previous prime is 206440655453. The next prime is 206440655543. The reversal of 206440655539 is 935556044602.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206440655539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 206440655492 and 206440655501.

It is not a weakly prime, because it can be changed into another prime (206440655579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103220327769 + 103220327770.

It is an arithmetic number, because the mean of its divisors is an integer number (103220327770).

Almost surely, 2^206440655539 is an apocalyptic number.

206440655539 is a deficient number, since it is larger than the sum of its proper divisors (1).

206440655539 is an equidigital number, since it uses as much as digits as its factorization.

206440655539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888000, while the sum is 49.

The spelling of 206440655539 in words is "two hundred six billion, four hundred forty million, six hundred fifty-five thousand, five hundred thirty-nine".