66823012468 has 24 divisors (see below), whose sum is σ = 122366887272. Its totient is φ = 31895121024.

The previous prime is 66823012439. The next prime is 66823012469. The reversal of 66823012468 is 86421032866.

It can be written as a sum of positive squares in 4 ways, for example, as 36415325584 + 30407686884 = 190828^2 + 174378^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66823012469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4251655 + ... + 4267342.

It is an arithmetic number, because the mean of its divisors is an integer number (5098620303).

Almost surely, 2^66823012468 is an apocalyptic number.

It is an amenable number.

66823012468 is a deficient number, since it is larger than the sum of its proper divisors (55543874804).

66823012468 is a wasteful number, since it uses less digits than its factorization.

66823012468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8519091 (or 8519089 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 46.

The spelling of 66823012468 in words is "sixty-six billion, eight hundred twenty-three million, twelve thousand, four hundred sixty-eight".