2640522505 has 4 divisors (see below), whose sum is σ = 3168627012. Its totient is φ = 2112418000.

The previous prime is 2640522491. The next prime is 2640522509. The reversal of 2640522505 is 5052250462.

It is a happy number.

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 1937848441 + 702674064 = 44021^2 + 26508^2 .

It is not a de Polignac number, because 2640522505 - 2¹¹ = 2640520457 is a prime.

It is a super-2 number, since 2×2640522505² = 13944718198822950050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2640522509) 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, 264052246 + ... + 264052255.

It is an arithmetic number, because the mean of its divisors is an integer number (792156753).

Almost surely, 2^2640522505 is an apocalyptic number.

It is an amenable number.

2640522505 is a deficient number, since it is larger than the sum of its proper divisors (528104507).

2640522505 is an equidigital number, since it uses as much as digits as its factorization.

2640522505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528104506.

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 2640522505 is about 51386.0146829855. The cubic root of 2640522505 is about 1382.1758200554.

Adding to 2640522505 its reverse (5052250462), we get a palindrome (7692772967).

The spelling of 2640522505 in words is "two billion, six hundred forty million, five hundred twenty-two thousand, five hundred five".