66709834746 has 24 divisors (see below), whose sum is σ = 140811345504. Its totient is φ = 21066262920.

The previous prime is 66709834733. The next prime is 66709834747. The reversal of 66709834746 is 64743890766.

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 66709834746.

It is not an unprimeable number, because it can be changed into a prime (66709834747) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15397150 + ... + 15401481.

It is an arithmetic number, because the mean of its divisors is an integer number (5867139396).

Almost surely, 2^66709834746 is an apocalyptic number.

66709834746 is an abundant number, since it is smaller than the sum of its proper divisors (74101510758).

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

66709834746 is a wasteful number, since it uses less digits than its factorization.

66709834746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30798674 (or 30798655 counting only the distinct ones).

The product of its (nonzero) digits is 36578304, while the sum is 60.

The spelling of 66709834746 in words is "sixty-six billion, seven hundred nine million, eight hundred thirty-four thousand, seven hundred forty-six".