66813129792 has 42 divisors (see below), whose sum is σ = 191507774718. Its totient is φ = 22271043072.

The previous prime is 66813129767. The next prime is 66813129809. The reversal of 66813129792 is 29792131866.

It can be written as a sum of positive squares in only one way, i.e., 62048817216 + 4764312576 = 249096^2 + 69024^2 .

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 57996933 + ... + 57998084.

Almost surely, 2^66813129792 is an apocalyptic number.

It is an amenable number.

66813129792 is an abundant number, since it is smaller than the sum of its proper divisors (124694644926).

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

66813129792 is a wasteful number, since it uses less digits than its factorization.

66813129792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115995035 (or 115995022 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The spelling of 66813129792 in words is "sixty-six billion, eight hundred thirteen million, one hundred twenty-nine thousand, seven hundred ninety-two".