2165722907 has 16 divisors (see below), whose sum is σ = 2244464640. Its totient is φ = 2088415392.

The previous prime is 2165722891. The next prime is 2165722913. The reversal of 2165722907 is 7092275612.

It is a cyclic number.

It is not a de Polignac number, because 2165722907 - 2⁴ = 2165722891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2165722997) 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, 1761569 + ... + 1762797.

It is an arithmetic number, because the mean of its divisors is an integer number (140279040).

Almost surely, 2^2165722907 is an apocalyptic number.

2165722907 is a deficient number, since it is larger than the sum of its proper divisors (78741733).

2165722907 is a wasteful number, since it uses less digits than its factorization.

2165722907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1762.

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 2165722907 is about 46537.3281033624. The cubic root of 2165722907 is about 1293.8014396002.

The spelling of 2165722907 in words is "two billion, one hundred sixty-five million, seven hundred twenty-two thousand, nine hundred seven".