206140405439 has 2 divisors, whose sum is σ = 206140405440. Its totient is φ = 206140405438.

The previous prime is 206140405403. The next prime is 206140405453. The reversal of 206140405439 is 934504041602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 206140405439 - 2²⁸ = 205871969983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206140405039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103070202719 + 103070202720.

It is an arithmetic number, because the mean of its divisors is an integer number (103070202720).

Almost surely, 2^206140405439 is an apocalyptic number.

206140405439 is a deficient number, since it is larger than the sum of its proper divisors (1).

206140405439 is an equidigital number, since it uses as much as digits as its factorization.

206140405439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 206140405439 in words is "two hundred six billion, one hundred forty million, four hundred five thousand, four hundred thirty-nine".