66553222 has 16 divisors (see below), whose sum is σ = 102435840. Its totient is φ = 32414728.

The previous prime is 66553217. The next prime is 66553247. The reversal of 66553222 is 22235566.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19779 + ... + 22897.

It is an arithmetic number, because the mean of its divisors is an integer number (6402240).

Almost surely, 2^66553222 is an apocalyptic number.

66553222 is a deficient number, since it is larger than the sum of its proper divisors (35882618).

66553222 is a wasteful number, since it uses less digits than its factorization.

66553222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3395.

The product of its digits is 21600, while the sum is 31.

The square root of 66553222 is about 8158.0158126839. The cubic root of 66553222 is about 405.2500046620.

Adding to 66553222 its reverse (22235566), we get a palindrome (88788788).

The spelling of 66553222 in words is "sixty-six million, five hundred fifty-three thousand, two hundred twenty-two".