66443450 has 24 divisors (see below), whose sum is σ = 125921628. Its totient is φ = 26074880.

The previous prime is 66443449. The next prime is 66443467. The reversal of 66443450 is 5434466.

It can be written as a sum of positive squares in 6 ways, for example, as 28015849 + 38427601 = 5293^2 + 6199^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 9887 + ... + 15186.

Almost surely, 2^66443450 is an apocalyptic number.

66443450 is a deficient number, since it is larger than the sum of its proper divisors (59478178).

66443450 is a wasteful number, since it uses less digits than its factorization.

66443450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25138 (or 25133 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 66443450 is about 8151.2851747439. The cubic root of 66443450 is about 405.0270773950.

The spelling of 66443450 in words is "sixty-six million, four hundred forty-three thousand, four hundred fifty".