215320066 has 48 divisors (see below), whose sum is σ = 373109184. Its totient is φ = 92464416.

The previous prime is 215320037. The next prime is 215320073. The reversal of 215320066 is 660023512.

It is a self number, because there is not a number n which added to its sum of digits gives 215320066.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1320901 + ... + 1321063.

It is an arithmetic number, because the mean of its divisors is an integer number (7773108).

Almost surely, 2^215320066 is an apocalyptic number.

215320066 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

215320066 is a deficient number, since it is larger than the sum of its proper divisors (157789118).

215320066 is a wasteful number, since it uses less digits than its factorization.

215320066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295 (or 248 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 215320066 is about 14673.7883997283. The cubic root of 215320066 is about 599.3697697296.

Adding to 215320066 its reverse (660023512), we get a palindrome (875343578).

The spelling of 215320066 in words is "two hundred fifteen million, three hundred twenty thousand, sixty-six".