2215651640656 has 40 divisors (see below), whose sum is σ = 4368145670784. Its totient is φ = 1088494753920.

The previous prime is 2215651640647. The next prime is 2215651640669. The reversal of 2215651640656 is 6560461565122.

It is a super-2 number, since 2×2215651640656² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2995476 + ... + 3661171.

Almost surely, 2^{2215651640656} is an apocalyptic number.

It is an amenable number.

2215651640656 is a deficient number, since it is larger than the sum of its proper divisors (2152494030128).

2215651640656 is a wasteful number, since it uses less digits than its factorization.

2215651640656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6657019 (or 6657013 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 49.

The spelling of 2215651640656 in words is "two trillion, two hundred fifteen billion, six hundred fifty-one million, six hundred forty thousand, six hundred fifty-six".