66404122 has 16 divisors (see below), whose sum is σ = 102516552. Its totient is φ = 32235840.

The previous prime is 66404119. The next prime is 66404123. The reversal of 66404122 is 22140466.

It can be written as a sum of positive squares in 4 ways, for example, as 66243321 + 160801 = 8139^2 + 401^2 .

It is not an unprimeable number, because it can be changed into a prime (66404123) 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 7 ways as a sum of consecutive naturals, for example, 60208 + ... + 61300.

Almost surely, 2^66404122 is an apocalyptic number.

66404122 is a deficient number, since it is larger than the sum of its proper divisors (36112430).

66404122 is a wasteful number, since it uses less digits than its factorization.

66404122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1953.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 66404122 is about 8148.8724373376. The cubic root of 66404122 is about 404.9471495330.

Adding to 66404122 its reverse (22140466), we get a palindrome (88544588).

The spelling of 66404122 in words is "sixty-six million, four hundred four thousand, one hundred twenty-two".