66513222 has 24 divisors (see below), whose sum is σ = 144724320. Its totient is φ = 22076880.

The previous prime is 66513203. The next prime is 66513283. The reversal of 66513222 is 22231566.

66513222 is a `hidden beast` number, since 6 + 651 + 3 + 2 + 2 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3429 + ... + 12032.

It is an arithmetic number, because the mean of its divisors is an integer number (6030180).

Almost surely, 2^66513222 is an apocalyptic number.

66513222 is an abundant number, since it is smaller than the sum of its proper divisors (78211098).

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

66513222 is a wasteful number, since it uses less digits than its factorization.

66513222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15708 (or 15705 counting only the distinct ones).

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

The square root of 66513222 is about 8155.5638676918. The cubic root of 66513222 is about 405.1688002349.

Adding to 66513222 its reverse (22231566), we get a palindrome (88744788).

The spelling of 66513222 in words is "sixty-six million, five hundred thirteen thousand, two hundred twenty-two".