66913790329 has 3 divisors (see below), whose sum is σ = 66914049007. Its totient is φ = 66913531652.

The previous prime is 66913790327. The next prime is 66913790357. The reversal of 66913790329 is 92309731966.

The square root of 66913790329 is 258677.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 52622066025 + 14291724304 = 229395^2 + 119548^2 .

It is not a de Polignac number, because 66913790329 - 2¹ = 66913790327 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66913790329.

It is not an unprimeable number, because it can be changed into a prime (66913790327) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 129339 + ... + 388015.

Almost surely, 2^66913790329 is an apocalyptic number.

66913790329 is the 258677-th square number.

66913790329 is the 129339-th centered octagonal number.

It is an amenable number.

66913790329 is a deficient number, since it is larger than the sum of its proper divisors (258678).

66913790329 is an frugal number, since it uses more digits than its factorization.

66913790329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517354 (or 258677 counting only the distinct ones).

The product of its (nonzero) digits is 3306744, while the sum is 55.

The spelling of 66913790329 in words is "sixty-six billion, nine hundred thirteen million, seven hundred ninety thousand, three hundred twenty-nine".