215256877056 has 192 divisors, whose sum is σ = 686694153600. Its totient is φ = 66232664064.

The previous prime is 215256877049. The next prime is 215256877081. The reversal of 215256877056 is 650778652512.

215256877056 is a `hidden beast` number, since 2 + 1 + 5 + 2 + 568 + 7 + 70 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 215256876993 and 215256877011.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 569125 + ... + 868571.

It is an arithmetic number, because the mean of its divisors is an integer number (3576532050).

Almost surely, 2^215256877056 is an apocalyptic number.

215256877056 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215256877056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (343347076800).

215256877056 is an abundant number, since it is smaller than the sum of its proper divisors (471437276544).

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

215256877056 is a wasteful number, since it uses less digits than its factorization.

215256877056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299491 (or 299465 counting only the distinct ones).

The product of its (nonzero) digits is 7056000, while the sum is 54.

The spelling of 215256877056 in words is "two hundred fifteen billion, two hundred fifty-six million, eight hundred seventy-seven thousand, fifty-six".