2540609165 has 4 divisors (see below), whose sum is σ = 3048731004. Its totient is φ = 2032487328.

The previous prime is 2540609147. The next prime is 2540609173. The reversal of 2540609165 is 5619060452.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 288252484 + 2252356681 = 16978^2 + 47459^2 .

It is a cyclic number.

It is not a de Polignac number, because 2540609165 - 2¹⁴ = 2540592781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254060912 + ... + 254060921.

It is an arithmetic number, because the mean of its divisors is an integer number (762182751).

Almost surely, 2^2540609165 is an apocalyptic number.

It is an amenable number.

2540609165 is a deficient number, since it is larger than the sum of its proper divisors (508121839).

2540609165 is an equidigital number, since it uses as much as digits as its factorization.

2540609165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508121838.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 2540609165 is about 50404.4558050179. The cubic root of 2540609165 is about 1364.5180558737.

The spelling of 2540609165 in words is "two billion, five hundred forty million, six hundred nine thousand, one hundred sixty-five".