66231812 has 12 divisors (see below), whose sum is σ = 120945216. Its totient is φ = 31676040.

The previous prime is 66231811. The next prime is 66231817. The reversal of 66231812 is 21813266.

66231812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (66231811) 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, 359864 + ... + 360047.

It is an arithmetic number, because the mean of its divisors is an integer number (10078768).

Almost surely, 2^66231812 is an apocalyptic number.

It is an amenable number.

66231812 is a deficient number, since it is larger than the sum of its proper divisors (54713404).

66231812 is a wasteful number, since it uses less digits than its factorization.

66231812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719938 (or 719936 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 66231812 is about 8138.2929413975. The cubic root of 66231812 is about 404.5965845281.

The spelling of 66231812 in words is "sixty-six million, two hundred thirty-one thousand, eight hundred twelve".