215116656 has 20 divisors (see below), whose sum is σ = 555718152. Its totient is φ = 71705536.

The previous prime is 215116639. The next prime is 215116669. The reversal of 215116656 is 656611512.

215116656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2240751 + ... + 2240846.

Almost surely, 2^215116656 is an apocalyptic number.

It is an amenable number.

215116656 is an abundant number, since it is smaller than the sum of its proper divisors (340601496).

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

215116656 is a wasteful number, since it uses less digits than its factorization.

215116656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4481608 (or 4481602 counting only the distinct ones).

The product of its digits is 10800, while the sum is 33.

The square root of 215116656 is about 14666.8556957516. The cubic root of 215116656 is about 599.1809713845.

The spelling of 215116656 in words is "two hundred fifteen million, one hundred sixteen thousand, six hundred fifty-six".