66913618829 has 4 divisors (see below), whose sum is σ = 66975177984. Its totient is φ = 66852059676.

The previous prime is 66913618819. The next prime is 66913618867. The reversal of 66913618829 is 92881631966.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66913618829 - 2¹⁶ = 66913553293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66913618819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30777947 + ... + 30780120.

It is an arithmetic number, because the mean of its divisors is an integer number (16743794496).

Almost surely, 2^66913618829 is an apocalyptic number.

It is an amenable number.

66913618829 is a deficient number, since it is larger than the sum of its proper divisors (61559155).

66913618829 is a wasteful number, since it uses less digits than its factorization.

66913618829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61559154.

The product of its digits is 6718464, while the sum is 59.

The spelling of 66913618829 in words is "sixty-six billion, nine hundred thirteen million, six hundred eighteen thousand, eight hundred twenty-nine".