215517382056 has 96 divisors (see below), whose sum is σ = 614054844000. Its totient is φ = 68186251392.

The previous prime is 215517382051. The next prime is 215517382079. The reversal of 215517382056 is 650283715512.

215517382056 is a `hidden beast` number, since 2 + 1 + 5 + 517 + 3 + 82 + 0 + 56 = 666.

It is not an unprimeable number, because it can be changed into a prime (215517382051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 751530 + ... + 997913.

It is an arithmetic number, because the mean of its divisors is an integer number (6396404625).

Almost surely, 2^215517382056 is an apocalyptic number.

It is an amenable number.

215517382056 is an abundant number, since it is smaller than the sum of its proper divisors (398537461944).

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

215517382056 is a wasteful number, since it uses less digits than its factorization.

215517382056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749543 (or 1749536 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 45.

The spelling of 215517382056 in words is "two hundred fifteen billion, five hundred seventeen million, three hundred eighty-two thousand, fifty-six".