215616055 has 4 divisors (see below), whose sum is σ = 258739272. Its totient is φ = 172492840.

The previous prime is 215616019. The next prime is 215616059. The reversal of 215616055 is 550616512.

215616055 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 215616055 - 2⁷ = 215615927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215616059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21561601 + ... + 21561610.

It is an arithmetic number, because the mean of its divisors is an integer number (64684818).

Almost surely, 2^215616055 is an apocalyptic number.

215616055 is a deficient number, since it is larger than the sum of its proper divisors (43123217).

215616055 is an equidigital number, since it uses as much as digits as its factorization.

215616055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43123216.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 215616055 is about 14683.8705728428. The cubic root of 215616055 is about 599.6442845229.

The spelling of 215616055 in words is "two hundred fifteen million, six hundred sixteen thousand, fifty-five".