66599444 has 12 divisors (see below), whose sum is σ = 121616544. Its totient is φ = 31851864.

The previous prime is 66599443. The next prime is 66599447. The reversal of 66599444 is 44499566.

66599444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66599444² = 8870971882218272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66599441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 361862 + ... + 362045.

It is an arithmetic number, because the mean of its divisors is an integer number (10134712).

Almost surely, 2^66599444 is an apocalyptic number.

It is an amenable number.

66599444 is a deficient number, since it is larger than the sum of its proper divisors (55017100).

66599444 is a wasteful number, since it uses less digits than its factorization.

66599444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723934 (or 723932 counting only the distinct ones).

The product of its digits is 933120, while the sum is 47.

The square root of 66599444 is about 8160.8482402260. The cubic root of 66599444 is about 405.3437999255.

The spelling of 66599444 in words is "sixty-six million, five hundred ninety-nine thousand, four hundred forty-four".