2215663223661 has 24 divisors (see below), whose sum is σ = 3205386138240. Its totient is φ = 1474809336000.

The previous prime is 2215663223647. The next prime is 2215663223723. The reversal of 2215663223661 is 1663223665122.

2215663223661 is a `hidden beast` number, since 2 + 2 + 1 + 5 + 6 + 632 + 2 + 3 + 6 + 6 + 1 = 666.

It is not a de Polignac number, because 2215663223661 - 2¹⁹ = 2215662699373 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2215663223561) 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 23 ways as a sum of consecutive naturals, for example, 44243086 + ... + 44293136.

It is an arithmetic number, because the mean of its divisors is an integer number (133557755760).

Almost surely, 2^{2215663223661} is an apocalyptic number.

It is an amenable number.

2215663223661 is a deficient number, since it is larger than the sum of its proper divisors (989722914579).

2215663223661 is a wasteful number, since it uses less digits than its factorization.

2215663223661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57617 (or 57614 counting only the distinct ones).

The product of its digits is 933120, while the sum is 45.

Adding to 2215663223661 its reverse (1663223665122), we get a palindrome (3878886888783).

The spelling of 2215663223661 in words is "two trillion, two hundred fifteen billion, six hundred sixty-three million, two hundred twenty-three thousand, six hundred sixty-one".