215968393256 has 64 divisors (see below), whose sum is σ = 505368996480. Its totient is φ = 84058894080.

The previous prime is 215968393231. The next prime is 215968393273. The reversal of 215968393256 is 652393869512.

It is a hoax number, since the sum of its digits (59) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 215968393195 and 215968393204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 438326 + ... + 789978.

It is an arithmetic number, because the mean of its divisors is an integer number (7896390570).

Almost surely, 2^215968393256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215968393256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (252684498240).

215968393256 is an abundant number, since it is smaller than the sum of its proper divisors (289400603224).

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

215968393256 is a wasteful number, since it uses less digits than its factorization.

215968393256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352674 (or 352670 counting only the distinct ones).

The product of its digits is 20995200, while the sum is 59.

The spelling of 215968393256 in words is "two hundred fifteen billion, nine hundred sixty-eight million, three hundred ninety-three thousand, two hundred fifty-six".