66445312 has 28 divisors (see below), whose sum is σ = 132898896. Its totient is φ = 33218560.

The previous prime is 66445289. The next prime is 66445361. The reversal of 66445312 is 21354466.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4137 + ... + 12247.

Almost surely, 2^66445312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66445312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66449448).

66445312 is an abundant number, since it is smaller than the sum of its proper divisors (66453584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66445312 is an frugal number, since it uses more digits than its factorization.

66445312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8137 (or 8113 counting only the distinct ones).

The product of its digits is 17280, while the sum is 31.

The square root of 66445312 is about 8151.3993890620. The cubic root of 66445312 is about 405.0308608298.

Adding to 66445312 its reverse (21354466), we get a palindrome (87799778).

The spelling of 66445312 in words is "sixty-six million, four hundred forty-five thousand, three hundred twelve".