2105539857739 has 2 divisors, whose sum is σ = 2105539857740. Its totient is φ = 2105539857738.

The previous prime is 2105539857713. The next prime is 2105539857781. The reversal of 2105539857739 is 9377589355012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2105539857739 - 2⁷ = 2105539857611 is a prime.

It is not a weakly prime, because it can be changed into another prime (2105539557739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1052769928869 + 1052769928870.

It is an arithmetic number, because the mean of its divisors is an integer number (1052769928870).

Almost surely, 2^{2105539857739} is an apocalyptic number.

2105539857739 is a deficient number, since it is larger than the sum of its proper divisors (1).

2105539857739 is an equidigital number, since it uses as much as digits as its factorization.

2105539857739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 71442000, while the sum is 64.

The spelling of 2105539857739 in words is "two trillion, one hundred five billion, five hundred thirty-nine million, eight hundred fifty-seven thousand, seven hundred thirty-nine".