215881478768 has 20 divisors (see below), whose sum is σ = 424161499248. Its totient is φ = 106420446720.

The previous prime is 215881478759. The next prime is 215881478779. The reversal of 215881478768 is 867874188512.

It is a congruent number.

It is an unprimeable number.

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, 95017121 + ... + 95019392.

Almost surely, 2^215881478768 is an apocalyptic number.

It is an amenable number.

215881478768 is a deficient number, since it is larger than the sum of its proper divisors (208280020480).

215881478768 is a wasteful number, since it uses less digits than its factorization.

215881478768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190036592 (or 190036586 counting only the distinct ones).

The product of its digits is 48168960, while the sum is 65.

The spelling of 215881478768 in words is "two hundred fifteen billion, eight hundred eighty-one million, four hundred seventy-eight thousand, seven hundred sixty-eight".