216366593 has 6 divisors (see below), whose sum is σ = 224085654. Its totient is φ = 208904864.

The previous prime is 216366581. The next prime is 216366613. The reversal of 216366593 is 395663612.

216366593 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 5303809 + 211062784 = 2303^2 + 14528^2 .

It is not a de Polignac number, because 216366593 - 2²⁶ = 149257729 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 216366593.

It is not an unprimeable number, because it can be changed into a prime (216366503) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 127796 + ... + 129477.

It is an arithmetic number, because the mean of its divisors is an integer number (37347609).

Almost surely, 2^216366593 is an apocalyptic number.

It is an amenable number.

216366593 is a deficient number, since it is larger than the sum of its proper divisors (7719061).

216366593 is an equidigital number, since it uses as much as digits as its factorization.

216366593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257331 (or 257302 counting only the distinct ones).

The product of its digits is 174960, while the sum is 41.

The square root of 216366593 is about 14709.4049165831. The cubic root of 216366593 is about 600.3392461136.

The spelling of 216366593 in words is "two hundred sixteen million, three hundred sixty-six thousand, five hundred ninety-three".