2215864825664 has 84 divisors (see below), whose sum is σ = 5137940594304. Its totient is φ = 945397506816.

The previous prime is 2215864825661. The next prime is 2215864825679. The reversal of 2215864825664 is 4665284685122.

It is a happy number.

It is a super-2 number, since 2×2215864825664² (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 (2215864825661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 884954 + ... + 2283609.

It is an arithmetic number, because the mean of its divisors is an integer number (61165959456).

Almost surely, 2^{2215864825664} is an apocalyptic number.

It is an amenable number.

2215864825664 is an abundant number, since it is smaller than the sum of its proper divisors (2922075768640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2215864825664 is a wasteful number, since it uses less digits than its factorization.

2215864825664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3168812 (or 3168795 counting only the distinct ones).

The product of its digits is 44236800, while the sum is 59.

The spelling of 2215864825664 in words is "two trillion, two hundred fifteen billion, eight hundred sixty-four million, eight hundred twenty-five thousand, six hundred sixty-four".