215664055 has 8 divisors (see below), whose sum is σ = 267145344. Its totient is φ = 166965600.

The previous prime is 215664047. The next prime is 215664067. The reversal of 215664055 is 550466512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 215664055 - 2³ = 215664047 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 215664055.

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 7 ways as a sum of consecutive naturals, for example, 695536 + ... + 695845.

It is an arithmetic number, because the mean of its divisors is an integer number (33393168).

Almost surely, 2^215664055 is an apocalyptic number.

215664055 is a deficient number, since it is larger than the sum of its proper divisors (51481289).

215664055 is a wasteful number, since it uses less digits than its factorization.

215664055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1391417.

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 215664055 is about 14685.5049283298. The cubic root of 215664055 is about 599.6887784113.

The spelling of 215664055 in words is "two hundred fifteen million, six hundred sixty-four thousand, fifty-five".