215223066 has 12 divisors (see below), whose sum is σ = 466316682. Its totient is φ = 71741016.

The previous prime is 215223061. The next prime is 215223101. The reversal of 215223066 is 660322512.

It can be written as a sum of positive squares in only one way, i.e., 194017041 + 21206025 = 13929^2 + 4605^2 .

It is not an unprimeable number, because it can be changed into a prime (215223061) 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, 5978401 + ... + 5978436.

Almost surely, 2^215223066 is an apocalyptic number.

215223066 is an abundant number, since it is smaller than the sum of its proper divisors (251093616).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215223066 is a wasteful number, since it uses less digits than its factorization.

215223066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11956845 (or 11956842 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 215223066 is about 14670.4828141408. The cubic root of 215223066 is about 599.2797524183.

Adding to 215223066 its reverse (660322512), we get a palindrome (875545578).

The spelling of 215223066 in words is "two hundred fifteen million, two hundred twenty-three thousand, sixty-six".