66444443 has 8 divisors (see below), whose sum is σ = 72769200. Its totient is φ = 60293088.

The previous prime is 66444437. The next prime is 66444461. The reversal of 66444443 is 34444466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66444443 - 2⁸ = 66444187 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (66444403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42548 + ... + 44081.

It is an arithmetic number, because the mean of its divisors is an integer number (9096150).

Almost surely, 2^66444443 is an apocalyptic number.

66444443 is a deficient number, since it is larger than the sum of its proper divisors (6324757).

66444443 is a wasteful number, since it uses less digits than its factorization.

66444443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86701.

The product of its digits is 110592, while the sum is 35.

The square root of 66444443 is about 8151.3460851567. The cubic root of 66444443 is about 405.0290951002.

The spelling of 66444443 in words is "sixty-six million, four hundred forty-four thousand, four hundred forty-three".