2165523113212 has 12 divisors (see below), whose sum is σ = 3789682358560. Its totient is φ = 1082756725056.

The previous prime is 2165523113191. The next prime is 2165523113249. The reversal of 2165523113212 is 2123113255612.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 83037 + ... + 2082772.

Almost surely, 2^{2165523113212} is an apocalyptic number.

It is an amenable number.

2165523113212 is a deficient number, since it is larger than the sum of its proper divisors (1624159245348).

2165523113212 is a wasteful number, since it uses less digits than its factorization.

2165523113212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2415780 (or 2415778 counting only the distinct ones).

The product of its digits is 21600, while the sum is 34.

Adding to 2165523113212 its reverse (2123113255612), we get a palindrome (4288636368824).

The spelling of 2165523113212 in words is "two trillion, one hundred sixty-five billion, five hundred twenty-three million, one hundred thirteen thousand, two hundred twelve".