66444430 has 16 divisors (see below), whose sum is σ = 128800224. Its totient is φ = 24533280.

The previous prime is 66444421. The next prime is 66444431. The reversal of 66444430 is 3444466.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66444392 and 66444401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66444431) 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, 255426 + ... + 255685.

It is an arithmetic number, because the mean of its divisors is an integer number (8050014).

Almost surely, 2^66444430 is an apocalyptic number.

66444430 is a deficient number, since it is larger than the sum of its proper divisors (62355794).

66444430 is a wasteful number, since it uses less digits than its factorization.

66444430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511131.

The product of its (nonzero) digits is 27648, while the sum is 31.

The square root of 66444430 is about 8151.3452877424. The cubic root of 66444430 is about 405.0290686853.

Adding to 66444430 its reverse (3444466), we get a palindrome (69888896).

The spelling of 66444430 in words is "sixty-six million, four hundred forty-four thousand, four hundred thirty".