2105855875787 has 4 divisors (see below), whose sum is σ = 2105918292336. Its totient is φ = 2105793459240.

The previous prime is 2105855875667. The next prime is 2105855875819. The reversal of 2105855875787 is 7875785585012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2105855875787 - 2³⁸ = 1830977968843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2105855875987) 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 in 3 ways as a sum of consecutive naturals, for example, 31157639 + ... + 31225152.

It is an arithmetic number, because the mean of its divisors is an integer number (526479573084).

Almost surely, 2^{2105855875787} is an apocalyptic number.

2105855875787 is a deficient number, since it is larger than the sum of its proper divisors (62416549).

2105855875787 is an equidigital number, since it uses as much as digits as its factorization.

2105855875787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62416548.

The product of its (nonzero) digits is 219520000, while the sum is 68.

The spelling of 2105855875787 in words is "two trillion, one hundred five billion, eight hundred fifty-five million, eight hundred seventy-five thousand, seven hundred eighty-seven".