66447826 has 12 divisors (see below), whose sum is σ = 105194862. Its totient is φ = 31474944.

The previous prime is 66447803. The next prime is 66447827. The reversal of 66447826 is 62874466.

It can be written as a sum of positive squares in only one way, i.e., 66438801 + 9025 = 8151^2 + 95^2 .

It is not an unprimeable number, because it can be changed into a prime (66447827) 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 5 ways as a sum of consecutive naturals, for example, 45295 + ... + 46738.

Almost surely, 2^66447826 is an apocalyptic number.

66447826 is a deficient number, since it is larger than the sum of its proper divisors (38747036).

66447826 is a wasteful number, since it uses less digits than its factorization.

66447826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92073 (or 92054 counting only the distinct ones).

The product of its digits is 387072, while the sum is 43.

The square root of 66447826 is about 8151.5535942543. The cubic root of 66447826 is about 405.0359689641.

It can be divided in two parts, 66 and 447826, that multiplied together give a triangular number (29556516 = T₇₆₈₈).

The spelling of 66447826 in words is "sixty-six million, four hundred forty-seven thousand, eight hundred twenty-six".