215216066 has 16 divisors (see below), whose sum is σ = 352060800. Its totient is φ = 98072208.

The previous prime is 215216041. The next prime is 215216077. The reversal of 215216066 is 660612512.

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, 50336 + ... + 54443.

It is an arithmetic number, because the mean of its divisors is an integer number (22003800).

Almost surely, 2^215216066 is an apocalyptic number.

215216066 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

215216066 is a deficient number, since it is larger than the sum of its proper divisors (136844734).

215216066 is a wasteful number, since it uses less digits than its factorization.

215216066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104873.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 215216066 is about 14670.2442379123. The cubic root of 215216066 is about 599.2732552774.

Adding to 215216066 its reverse (660612512), we get a palindrome (875828578).

The spelling of 215216066 in words is "two hundred fifteen million, two hundred sixteen thousand, sixty-six".