215566456 has 16 divisors (see below), whose sum is σ = 461928240. Its totient is φ = 92385600.

The previous prime is 215566453. The next prime is 215566459. The reversal of 215566456 is 654665512.

215566456 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (215566453) and next prime (215566459).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215566451) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1924645 + ... + 1924756.

It is an arithmetic number, because the mean of its divisors is an integer number (28870515).

Almost surely, 2^215566456 is an apocalyptic number.

It is an amenable number.

215566456 is an abundant number, since it is smaller than the sum of its proper divisors (246361784).

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

215566456 is a wasteful number, since it uses less digits than its factorization.

215566456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3849414 (or 3849410 counting only the distinct ones).

The product of its digits is 216000, while the sum is 40.

The square root of 215566456 is about 14682.1815817677. The cubic root of 215566456 is about 599.5983014942.

The spelling of 215566456 in words is "two hundred fifteen million, five hundred sixty-six thousand, four hundred fifty-six".