2113722765 has 96 divisors (see below), whose sum is σ = 4586729472. Its totient is φ = 874800000.

The previous prime is 2113722763. The next prime is 2113722781. The reversal of 2113722765 is 5672273112.

2113722765 is a `hidden beast` number, since 2 + 11 + 372 + 276 + 5 = 666.

It is not a de Polignac number, because 2113722765 - 2¹ = 2113722763 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2113722763) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 937890 + ... + 940140.

It is an arithmetic number, because the mean of its divisors is an integer number (47778432).

Almost surely, 2^2113722765 is an apocalyptic number.

It is an amenable number.

2113722765 is an abundant number, since it is smaller than the sum of its proper divisors (2473006707).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2113722765 is a wasteful number, since it uses less digits than its factorization.

2113722765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2551 (or 2548 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 2113722765 is about 45975.2407824037. The cubic root of 2113722765 is about 1283.3624899581.

Adding to 2113722765 its reverse (5672273112), we get a palindrome (7785995877).

The spelling of 2113722765 in words is "two billion, one hundred thirteen million, seven hundred twenty-two thousand, seven hundred sixty-five".