66768886767 has 32 divisors (see below), whose sum is σ = 100276254720. Its totient is φ = 39150864000.

The previous prime is 66768886747. The next prime is 66768886781. The reversal of 66768886767 is 76768886766.

It is not a de Polignac number, because 66768886767 - 2⁶ = 66768886703 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66768886747) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7267917 + ... + 7277097.

It is an arithmetic number, because the mean of its divisors is an integer number (3133632960).

Almost surely, 2^66768886767 is an apocalyptic number.

66768886767 is a deficient number, since it is larger than the sum of its proper divisors (33507367953).

66768886767 is a wasteful number, since it uses less digits than its factorization.

66768886767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16335.

The product of its digits is 1365590016, while the sum is 75.

Subtracting 66768886767 from its reverse (76768886766), we obtain a palindrome (9999999999).

The spelling of 66768886767 in words is "sixty-six billion, seven hundred sixty-eight million, eight hundred eighty-six thousand, seven hundred sixty-seven".