66734243766 has 32 divisors (see below), whose sum is σ = 148363438080. Its totient is φ = 22234980168.

The previous prime is 66734243713. The next prime is 66734243773.

66734243766 is a `hidden beast` number, since 66 + 73 + 424 + 37 + 66 = 666.

66734243766 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146686 + ... + 393681.

It is an arithmetic number, because the mean of its divisors is an integer number (4636357440).

Almost surely, 2^66734243766 is an apocalyptic number.

66734243766 is an abundant number, since it is smaller than the sum of its proper divisors (81629194314).

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

66734243766 is a wasteful number, since it uses less digits than its factorization.

66734243766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542665 (or 542659 counting only the distinct ones).

The product of its digits is 18289152, while the sum is 54.

The spelling of 66734243766 in words is "sixty-six billion, seven hundred thirty-four million, two hundred forty-three thousand, seven hundred sixty-six".