66763957664 has 48 divisors (see below), whose sum is σ = 137187691200. Its totient is φ = 31923302400.

The previous prime is 66763957621. The next prime is 66763957669. The reversal of 66763957664 is 46675936766.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 66763957664.

It is not an unprimeable number, because it can be changed into a prime (66763957669) 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 7 ways as a sum of consecutive naturals, for example, 4628864 + ... + 4643264.

It is an arithmetic number, because the mean of its divisors is an integer number (2858076900).

Almost surely, 2^66763957664 is an apocalyptic number.

It is an amenable number.

66763957664 is an abundant number, since it is smaller than the sum of its proper divisors (70423733536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66763957664 is a wasteful number, since it uses less digits than its factorization.

66763957664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20733 (or 20725 counting only the distinct ones).

The product of its digits is 205752960, while the sum is 65.

The spelling of 66763957664 in words is "sixty-six billion, seven hundred sixty-three million, nine hundred fifty-seven thousand, six hundred sixty-four".