215256561056 has 24 divisors (see below), whose sum is σ = 424904548320. Its totient is φ = 107344294848.

The previous prime is 215256561049. The next prime is 215256561059. The reversal of 215256561056 is 650165652512.

It is a junction number, because it is equal to n+sod(n) for n = 215256560998 and 215256561016.

It is not an unprimeable number, because it can be changed into a prime (215256561059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8862236 + ... + 8886491.

It is an arithmetic number, because the mean of its divisors is an integer number (17704356180).

Almost surely, 2^215256561056 is an apocalyptic number.

It is an amenable number.

215256561056 is a deficient number, since it is larger than the sum of its proper divisors (209647987264).

215256561056 is a wasteful number, since it uses less digits than its factorization.

215256561056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17749116 (or 17749108 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 44.

The spelling of 215256561056 in words is "two hundred fifteen billion, two hundred fifty-six million, five hundred sixty-one thousand, fifty-six".