66563397747 has 24 divisors (see below), whose sum is σ = 119871747840. Its totient is φ = 34578388080.

The previous prime is 66563397727. The next prime is 66563397781. The reversal of 66563397747 is 74779336566.

66563397747 is a `hidden beast` number, since 66 + 563 + 3 + 9 + 7 + 7 + 4 + 7 = 666.

It is not a de Polignac number, because 66563397747 - 2¹⁰ = 66563396723 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (66563397727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48024847 + ... + 48026232.

It is an arithmetic number, because the mean of its divisors is an integer number (4994656160).

Almost surely, 2^66563397747 is an apocalyptic number.

66563397747 is a deficient number, since it is larger than the sum of its proper divisors (53308350093).

66563397747 is a wasteful number, since it uses less digits than its factorization.

66563397747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96051103 (or 96051100 counting only the distinct ones).

The product of its digits is 120022560, while the sum is 63.

The spelling of 66563397747 in words is "sixty-six billion, five hundred sixty-three million, three hundred ninety-seven thousand, seven hundred forty-seven".