2116959745 has 4 divisors (see below), whose sum is σ = 2540351700. Its totient is φ = 1693567792.

The previous prime is 2116959673. The next prime is 2116959749. The reversal of 2116959745 is 5479596112.

It is a happy number.

2116959745 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 513838224 + 1603121521 = 22668^2 + 40039^2 .

It is a cyclic number.

It is not a de Polignac number, because 2116959745 - 2¹³ = 2116951553 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2116959749) 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, 211695970 + ... + 211695979.

It is an arithmetic number, because the mean of its divisors is an integer number (635087925).

Almost surely, 2^2116959745 is an apocalyptic number.

It is an amenable number.

2116959745 is a deficient number, since it is larger than the sum of its proper divisors (423391955).

2116959745 is an equidigital number, since it uses as much as digits as its factorization.

2116959745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423391954.

The product of its digits is 680400, while the sum is 49.

The square root of 2116959745 is about 46010.4308282372. The cubic root of 2116959745 is about 1284.0172746468.

The spelling of 2116959745 in words is "two billion, one hundred sixteen million, nine hundred fifty-nine thousand, seven hundred forty-five".