2115503021566 has 96 divisors (see below), whose sum is σ = 3767275008000. Its totient is φ = 887557070400.

The previous prime is 2115503021563. The next prime is 2115503021579. The reversal of 2115503021566 is 6651203055112.

It is a happy number.

It is a super-2 number, since 2×2115503021566² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2115503021563) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 440819235 + ... + 440824033.

It is an arithmetic number, because the mean of its divisors is an integer number (39242448000).

Almost surely, 2^{2115503021566} is an apocalyptic number.

2115503021566 is a deficient number, since it is larger than the sum of its proper divisors (1651771986434).

2115503021566 is a wasteful number, since it uses less digits than its factorization.

2115503021566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7606 (or 7595 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 37.

Adding to 2115503021566 its reverse (6651203055112), we get a palindrome (8766706076678).

The spelling of 2115503021566 in words is "two trillion, one hundred fifteen billion, five hundred three million, twenty-one thousand, five hundred sixty-six".