2636015263561 has 9 divisors (see below), whose sum is σ = 2640648971181. Its totient is φ = 2631389681292.

The previous prime is 2636015263549. The next prime is 2636015263573. The reversal of 2636015263561 is 1653625106362.

The square root of 2636015263561 is 1623581.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (2636015263549) and next prime (2636015263573).

It is not a de Polignac number, because 2636015263561 - 2¹⁹ = 2636014739273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2636015263261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1277757216 + ... + 1277759278.

Almost surely, 2^{2636015263561} is an apocalyptic number.

2636015263561 is the 1623581-st square number.

2636015263561 is the 811791-st centered octagonal number.

It is an amenable number.

2636015263561 is a deficient number, since it is larger than the sum of its proper divisors (4633707620).

2636015263561 is an frugal number, since it uses more digits than its factorization.

2636015263561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5700 (or 2850 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 46.

The spelling of 2636015263561 in words is "two trillion, six hundred thirty-six billion, fifteen million, two hundred sixty-three thousand, five hundred sixty-one".