66321522472 has 16 divisors (see below), whose sum is σ = 124360838100. Its totient is φ = 33158632320.

The previous prime is 66321522457. The next prime is 66321522473. The reversal of 66321522472 is 27422512366.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 52209508036 + 14112014436 = 228494^2 + 118794^2 .

It is not an unprimeable number, because it can be changed into a prime (66321522473) 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 3 ways as a sum of consecutive naturals, for example, 129597 + ... + 386572.

Almost surely, 2^66321522472 is an apocalyptic number.

It is an amenable number.

66321522472 is a deficient number, since it is larger than the sum of its proper divisors (58039315628).

66321522472 is a wasteful number, since it uses less digits than its factorization.

66321522472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532236 (or 532232 counting only the distinct ones).

The product of its digits is 241920, while the sum is 40.

The spelling of 66321522472 in words is "sixty-six billion, three hundred twenty-one million, five hundred twenty-two thousand, four hundred seventy-two".