66751615766 has 48 divisors (see below), whose sum is σ = 113985234720. Its totient is φ = 29261232000.

The previous prime is 66751615757. The next prime is 66751615769.

66751615766 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66751615769) 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 in 23 ways as a sum of consecutive naturals, for example, 6570791 + ... + 6580941.

It is an arithmetic number, because the mean of its divisors is an integer number (2374692390).

Almost surely, 2^66751615766 is an apocalyptic number.

66751615766 is a deficient number, since it is larger than the sum of its proper divisors (47233618954).

66751615766 is a wasteful number, since it uses less digits than its factorization.

66751615766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11141 (or 11130 counting only the distinct ones).

The product of its digits is 9525600, while the sum is 56.

The spelling of 66751615766 in words is "sixty-six billion, seven hundred fifty-one million, six hundred fifteen thousand, seven hundred sixty-six".