2543321165 has 32 divisors (see below), whose sum is σ = 3818776320. Its totient is φ = 1579737600.

The previous prime is 2543321153. The next prime is 2543321167. The reversal of 2543321165 is 5611233452.

It is a happy number.

It is not a de Polignac number, because 2543321165 - 2²⁴ = 2526543949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2543321167) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 96431 + ... + 119939.

It is an arithmetic number, because the mean of its divisors is an integer number (119336760).

Almost surely, 2^2543321165 is an apocalyptic number.

It is an amenable number.

2543321165 is a deficient number, since it is larger than the sum of its proper divisors (1275455155).

2543321165 is a wasteful number, since it uses less digits than its factorization.

2543321165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23813.

The product of its digits is 21600, while the sum is 32.

The square root of 2543321165 is about 50431.3510130355. The cubic root of 2543321165 is about 1365.0034062718.

The spelling of 2543321165 in words is "two billion, five hundred forty-three million, three hundred twenty-one thousand, one hundred sixty-five".