2165632513256 has 16 divisors (see below), whose sum is σ = 4061130812640. Its totient is φ = 1082664296560.

The previous prime is 2165632513189. The next prime is 2165632513277. The reversal of 2165632513256 is 6523152365612.

It is a self number, because there is not a number n which added to its sum of digits gives 2165632513256.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18934430 + ... + 19048461.

It is an arithmetic number, because the mean of its divisors is an integer number (253820675790).

Almost surely, 2^{2165632513256} is an apocalyptic number.

It is an amenable number.

2165632513256 is a deficient number, since it is larger than the sum of its proper divisors (1895498299384).

2165632513256 is a wasteful number, since it uses less digits than its factorization.

2165632513256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37990024 (or 37990020 counting only the distinct ones).

The product of its digits is 1944000, while the sum is 47.

Adding to 2165632513256 its reverse (6523152365612), we get a palindrome (8688784878868).

The spelling of 2165632513256 in words is "two trillion, one hundred sixty-five billion, six hundred thirty-two million, five hundred thirteen thousand, two hundred fifty-six".