2165440025 has 24 divisors (see below), whose sum is σ = 3249256320. Its totient is φ = 1397525760.

The previous prime is 2165440009. The next prime is 2165440031. The reversal of 2165440025 is 5200445612.

It is not a de Polignac number, because 2165440025 - 2⁴ = 2165440009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2165440025.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 360965 + ... + 366914.

It is an arithmetic number, because the mean of its divisors is an integer number (135385680).

Almost surely, 2^2165440025 is an apocalyptic number.

2165440025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2165440025 is a deficient number, since it is larger than the sum of its proper divisors (1083816295).

2165440025 is a wasteful number, since it uses less digits than its factorization.

2165440025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727913 (or 727908 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 2165440025 is about 46534.2887019883. The cubic root of 2165440025 is about 1293.7451059738.

Adding to 2165440025 its reverse (5200445612), we get a palindrome (7365885637).

The spelling of 2165440025 in words is "two billion, one hundred sixty-five million, four hundred forty thousand, twenty-five".