66431012 has 12 divisors (see below), whose sum is σ = 116360076. Its totient is φ = 33185280.

The previous prime is 66431009. The next prime is 66431023. The reversal of 66431012 is 21013466.

It is a happy number.

66431012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 36772096 + 29658916 = 6064^2 + 5446^2 .

It is an unprimeable number.

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, 2189 + ... + 11732.

It is an arithmetic number, because the mean of its divisors is an integer number (9696673).

Almost surely, 2^66431012 is an apocalyptic number.

It is an amenable number.

66431012 is a deficient number, since it is larger than the sum of its proper divisors (49929064).

66431012 is a wasteful number, since it uses less digits than its factorization.

66431012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15118 (or 15116 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 66431012 is about 8150.5221918599. The cubic root of 66431012 is about 405.0018025627.

Adding to 66431012 its reverse (21013466), we get a palindrome (87444478).

The spelling of 66431012 in words is "sixty-six million, four hundred thirty-one thousand, twelve".