2117985196847 has 4 divisors (see below), whose sum is σ = 2280907135080. Its totient is φ = 1955063258616.

The previous prime is 2117985196841. The next prime is 2117985196909. The reversal of 2117985196847 is 7486915897112.

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

It is not a de Polignac number, because 2117985196847 - 2⁶ = 2117985196783 is a prime.

It is a super-2 number, since 2×2117985196847² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2117985196841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81460969097 + ... + 81460969122.

It is an arithmetic number, because the mean of its divisors is an integer number (570226783770).

Almost surely, 2^{2117985196847} is an apocalyptic number.

2117985196847 is a deficient number, since it is larger than the sum of its proper divisors (162921938233).

2117985196847 is a wasteful number, since it uses less digits than its factorization.

2117985196847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162921938232.

The product of its digits is 60963840, while the sum is 68.

The spelling of 2117985196847 in words is "two trillion, one hundred seventeen billion, nine hundred eighty-five million, one hundred ninety-six thousand, eight hundred forty-seven".