2165784001 has 4 divisors (see below), whose sum is σ = 2173437232. Its totient is φ = 2158130772.

The previous prime is 2165783999. The next prime is 2165784007. The reversal of 2165784001 is 1004875612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2165784001 - 2¹ = 2165783999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2165784007) 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, 3826191 + ... + 3826756.

It is an arithmetic number, because the mean of its divisors is an integer number (543359308).

Almost surely, 2^2165784001 is an apocalyptic number.

It is an amenable number.

2165784001 is a deficient number, since it is larger than the sum of its proper divisors (7653231).

2165784001 is an equidigital number, since it uses as much as digits as its factorization.

2165784001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7653230.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 2165784001 is about 46537.9844965379. The cubic root of 2165784001 is about 1293.8136053243.

The spelling of 2165784001 in words is "two billion, one hundred sixty-five million, seven hundred eighty-four thousand, one".