8540720739839 has 2 divisors, whose sum is σ = 8540720739840. Its totient is φ = 8540720739838.

The previous prime is 8540720739787. The next prime is 8540720739841. The reversal of 8540720739839 is 9389370270458.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8540720739839 - 2²⁰ = 8540719691263 is a prime.

Together with 8540720739841, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8540720739869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4270360369919 + 4270360369920.

It is an arithmetic number, because the mean of its divisors is an integer number (4270360369920).

Almost surely, 2^{8540720739839} is an apocalyptic number.

8540720739839 is a deficient number, since it is larger than the sum of its proper divisors (1).

8540720739839 is an equidigital number, since it uses as much as digits as its factorization.

8540720739839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 91445760, while the sum is 65.

The spelling of 8540720739839 in words is "eight trillion, five hundred forty billion, seven hundred twenty million, seven hundred thirty-nine thousand, eight hundred thirty-nine".