66740134668 has 24 divisors (see below), whose sum is σ = 155749591872. Its totient is φ = 22243481424.

The previous prime is 66740134667. The next prime is 66740134691. The reversal of 66740134668 is 86643104766.

It is a self number, because there is not a number n which added to its sum of digits gives 66740134668.

It is not an unprimeable number, because it can be changed into a prime (66740134661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 316930 + ... + 483657.

It is an arithmetic number, because the mean of its divisors is an integer number (6489566328).

Almost surely, 2^66740134668 is an apocalyptic number.

It is an amenable number.

66740134668 is an abundant number, since it is smaller than the sum of its proper divisors (89009457204).

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

66740134668 is a wasteful number, since it uses less digits than its factorization.

66740134668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807541 (or 807539 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 51.

The spelling of 66740134668 in words is "sixty-six billion, seven hundred forty million, one hundred thirty-four thousand, six hundred sixty-eight".