215553644166 has 16 divisors (see below), whose sum is σ = 492694043904. Its totient is φ = 61586755464.

The previous prime is 215553644153. The next prime is 215553644177. The reversal of 215553644166 is 661446355512.

It is a happy number.

215553644166 is digitally balanced in base 3, 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 pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2566114770 + ... + 2566114853.

It is an arithmetic number, because the mean of its divisors is an integer number (30793377744).

Almost surely, 2^215553644166 is an apocalyptic number.

215553644166 is an abundant number, since it is smaller than the sum of its proper divisors (277140399738).

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

215553644166 is a wasteful number, since it uses less digits than its factorization.

215553644166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5132229635.

The product of its digits is 2592000, while the sum is 48.

Adding to 215553644166 its reverse (661446355512), we get a palindrome (876999999678).

The spelling of 215553644166 in words is "two hundred fifteen billion, five hundred fifty-three million, six hundred forty-four thousand, one hundred sixty-six".