66572613644 has 48 divisors (see below), whose sum is σ = 119850769920. Its totient is φ = 32336807040.

The previous prime is 66572613637. The next prime is 66572613659. The reversal of 66572613644 is 44631627566.

It is a junction number, because it is equal to n+sod(n) for n = 66572613592 and 66572613601.

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 15 ways as a sum of consecutive naturals, for example, 72439817 + ... + 72440735.

It is an arithmetic number, because the mean of its divisors is an integer number (2496891040).

Almost surely, 2^66572613644 is an apocalyptic number.

It is an amenable number.

66572613644 is a deficient number, since it is larger than the sum of its proper divisors (53278156276).

66572613644 is a wasteful number, since it uses less digits than its factorization.

66572613644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2358 (or 2356 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 50.

The spelling of 66572613644 in words is "sixty-six billion, five hundred seventy-two million, six hundred thirteen thousand, six hundred forty-four".