2117870561709 has 96 divisors (see below), whose sum is σ = 3728859204096. Its totient is φ = 1130714726400.

The previous prime is 2117870561671. The next prime is 2117870561731. The reversal of 2117870561709 is 9071650787112.

2117870561709 is a `hidden beast` number, since 2 + 1 + 1 + 7 + 8 + 7 + 0 + 561 + 70 + 9 = 666.

It is not a de Polignac number, because 2117870561709 - 2³⁶ = 2049151084973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2117870561309) 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 95 ways as a sum of consecutive naturals, for example, 303546829 + ... + 303553805.

It is an arithmetic number, because the mean of its divisors is an integer number (38842283376).

Almost surely, 2^{2117870561709} is an apocalyptic number.

It is an amenable number.

2117870561709 is a deficient number, since it is larger than the sum of its proper divisors (1610988642387).

2117870561709 is a wasteful number, since it uses less digits than its factorization.

2117870561709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9035 (or 9032 counting only the distinct ones).

The product of its (nonzero) digits is 1481760, while the sum is 54.

The spelling of 2117870561709 in words is "two trillion, one hundred seventeen billion, eight hundred seventy million, five hundred sixty-one thousand, seven hundred nine".