66555422 has 32 divisors (see below), whose sum is σ = 107308800. Its totient is φ = 30889408.

The previous prime is 66555409. The next prime is 66555427. The reversal of 66555422 is 22455566.

Its product of digits (72000) is a multiple of the sum of its prime divisors (400).

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66555427) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 371729 + ... + 371907.

It is an arithmetic number, because the mean of its divisors is an integer number (3353400).

Almost surely, 2^66555422 is an apocalyptic number.

66555422 is a deficient number, since it is larger than the sum of its proper divisors (40753378).

66555422 is a wasteful number, since it uses less digits than its factorization.

66555422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400.

The product of its digits is 72000, while the sum is 35.

The square root of 66555422 is about 8158.1506482781. The cubic root of 66555422 is about 405.2544699614.

The spelling of 66555422 in words is "sixty-six million, five hundred fifty-five thousand, four hundred twenty-two".