2117722945947 has 32 divisors (see below), whose sum is σ = 3230510100480. Its totient is φ = 1208814005280.

The previous prime is 2117722945909. The next prime is 2117722945957. The reversal of 2117722945947 is 7495492277112.

It is not a de Polignac number, because 2117722945947 - 2¹¹ = 2117722943899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2117722945957) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 165557122 + ... + 165569912.

It is an arithmetic number, because the mean of its divisors is an integer number (100953440640).

Almost surely, 2^{2117722945947} is an apocalyptic number.

2117722945947 is a deficient number, since it is larger than the sum of its proper divisors (1112787154533).

2117722945947 is a wasteful number, since it uses less digits than its factorization.

2117722945947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20743.

The product of its digits is 17781120, while the sum is 60.

The spelling of 2117722945947 in words is "two trillion, one hundred seventeen billion, seven hundred twenty-two million, nine hundred forty-five thousand, nine hundred forty-seven".