2118747985 has 16 divisors (see below), whose sum is σ = 2597677056. Its totient is φ = 1658579328.

The previous prime is 2118747959. The next prime is 2118747989. The reversal of 2118747985 is 5897478112.

It is a cyclic number.

It is not a de Polignac number, because 2118747985 - 2⁹ = 2118747473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2118747989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23502 + ... + 69208.

It is an arithmetic number, because the mean of its divisors is an integer number (162354816).

Almost surely, 2^2118747985 is an apocalyptic number.

It is an amenable number.

2118747985 is a deficient number, since it is larger than the sum of its proper divisors (478929071).

2118747985 is a wasteful number, since it uses less digits than its factorization.

2118747985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45912.

The product of its digits is 1128960, while the sum is 52.

The square root of 2118747985 is about 46029.8597108442. The cubic root of 2118747985 is about 1284.3787182737.

The spelling of 2118747985 in words is "two billion, one hundred eighteen million, seven hundred forty-seven thousand, nine hundred eighty-five".