66644724472 has 8 divisors (see below), whose sum is σ = 124958858400. Its totient is φ = 33322362232.

The previous prime is 66644724439. The next prime is 66644724473. The reversal of 66644724472 is 27442744666.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66644724473) 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 as a sum of consecutive naturals, namely, 4165295272 + ... + 4165295287.

It is an arithmetic number, because the mean of its divisors is an integer number (15619857300).

Almost surely, 2^66644724472 is an apocalyptic number.

It is an amenable number.

66644724472 is a deficient number, since it is larger than the sum of its proper divisors (58314133928).

66644724472 is a wasteful number, since it uses less digits than its factorization.

66644724472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8330590565 (or 8330590561 counting only the distinct ones).

The product of its digits is 10838016, while the sum is 52.

The spelling of 66644724472 in words is "sixty-six billion, six hundred forty-four million, seven hundred twenty-four thousand, four hundred seventy-two".