215145655 has 16 divisors (see below), whose sum is σ = 267115968. Its totient is φ = 166240000.

The previous prime is 215145653. The next prime is 215145661. The reversal of 215145655 is 556541512.

It is not a de Polignac number, because 215145655 - 2¹ = 215145653 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 215145655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215145653) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 15510 + ... + 25900.

It is an arithmetic number, because the mean of its divisors is an integer number (16694748).

Almost surely, 2^215145655 is an apocalyptic number.

215145655 is a deficient number, since it is larger than the sum of its proper divisors (51970313).

215145655 is a wasteful number, since it uses less digits than its factorization.

215145655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10538.

The product of its digits is 30000, while the sum is 34.

The square root of 215145655 is about 14667.8442519683. The cubic root of 215145655 is about 599.2078945566.

The spelling of 215145655 in words is "two hundred fifteen million, one hundred forty-five thousand, six hundred fifty-five".