215461247256 has 48 divisors (see below), whose sum is σ = 594551093760. Its totient is φ = 70465312320.

The previous prime is 215461247081. The next prime is 215461247311. The reversal of 215461247256 is 652742164512.

215461247256 is a `hidden beast` number, since 2 + 1 + 5 + 4 + 612 + 4 + 7 + 25 + 6 = 666.

215461247256 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×215461247256² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28227480 + ... + 28235111.

It is an arithmetic number, because the mean of its divisors is an integer number (12386481120).

Almost surely, 2^215461247256 is an apocalyptic number.

It is an amenable number.

215461247256 is an abundant number, since it is smaller than the sum of its proper divisors (379089846504).

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

215461247256 is a wasteful number, since it uses less digits than its factorization.

215461247256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56462656 (or 56462649 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The spelling of 215461247256 in words is "two hundred fifteen billion, four hundred sixty-one million, two hundred forty-seven thousand, two hundred fifty-six".