2163522543065 has 32 divisors (see below), whose sum is σ = 3040414665120. Its totient is φ = 1463056625664.

The previous prime is 2163522543047. The next prime is 2163522543097. The reversal of 2163522543065 is 5603452253612.

It can be written as a sum of positive squares in 16 ways, for example, as 5526286921 + 2157996256144 = 74339^2 + 1469012^2 .

It is a cyclic number.

It is not a de Polignac number, because 2163522543065 - 2²⁶ = 2163455434201 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26417750 + ... + 26499519.

It is an arithmetic number, because the mean of its divisors is an integer number (95012958285).

Almost surely, 2^{2163522543065} is an apocalyptic number.

It is an amenable number.

2163522543065 is a deficient number, since it is larger than the sum of its proper divisors (876892122055).

2163522543065 is a wasteful number, since it uses less digits than its factorization.

2163522543065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52917341.

The product of its (nonzero) digits is 1296000, while the sum is 44.

Adding to 2163522543065 its reverse (5603452253612), we get a palindrome (7766974796677).

The spelling of 2163522543065 in words is "two trillion, one hundred sixty-three billion, five hundred twenty-two million, five hundred forty-three thousand, sixty-five".