215663423 has 4 divisors (see below), whose sum is σ = 218701008. Its totient is φ = 212625840.

The previous prime is 215663369. The next prime is 215663431. The reversal of 215663423 is 324366512.

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

It is a cyclic number.

It is not a de Polignac number, because 215663423 - 2¹⁰ = 215662399 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 215663423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215663453) 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 3 ways as a sum of consecutive naturals, for example, 1518686 + ... + 1518827.

It is an arithmetic number, because the mean of its divisors is an integer number (54675252).

Almost surely, 2^215663423 is an apocalyptic number.

215663423 is a deficient number, since it is larger than the sum of its proper divisors (3037585).

215663423 is an equidigital number, since it uses as much as digits as its factorization.

215663423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3037584.

The product of its digits is 25920, while the sum is 32.

The square root of 215663423 is about 14685.4834104976. The cubic root of 215663423 is about 599.6881926180.

The spelling of 215663423 in words is "two hundred fifteen million, six hundred sixty-three thousand, four hundred twenty-three".