2515440645 has 12 divisors (see below), whose sum is σ = 4360097196. Its totient is φ = 1341568320.

The previous prime is 2515440623. The next prime is 2515440667. The reversal of 2515440645 is 5460445152.

2515440645 is a `hidden beast` number, since 2 + 5 + 1 + 5 + 4 + 4 + 0 + 645 = 666.

It is an interprime number because it is at equal distance from previous prime (2515440623) and next prime (2515440667).

It can be written as a sum of positive squares in 2 ways, for example, as 792028449 + 1723412196 = 28143^2 + 41514^2 .

It is not a de Polignac number, because 2515440645 - 2²⁵ = 2481886213 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27949296 + ... + 27949385.

It is an arithmetic number, because the mean of its divisors is an integer number (363341433).

Almost surely, 2^2515440645 is an apocalyptic number.

It is an amenable number.

2515440645 is a deficient number, since it is larger than the sum of its proper divisors (1844656551).

2515440645 is a wasteful number, since it uses less digits than its factorization.

2515440645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55898692 (or 55898689 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 36.

The square root of 2515440645 is about 50154.1687699039. The cubic root of 2515440645 is about 1359.9972327294.

Adding to 2515440645 its reverse (5460445152), we get a palindrome (7975885797).

The spelling of 2515440645 in words is "two billion, five hundred fifteen million, four hundred forty thousand, six hundred forty-five".