66039668621 has 8 divisors (see below), whose sum is σ = 69755330304. Its totient is φ = 62423091360.

The previous prime is 66039668609. The next prime is 66039668677. The reversal of 66039668621 is 12686693066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66039668621 is a prime.

It is a super-2 number, since 2×66039668621² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66039668021) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 24769736 + ... + 24772401.

It is an arithmetic number, because the mean of its divisors is an integer number (8719416288).

Almost surely, 2^66039668621 is an apocalyptic number.

It is an amenable number.

66039668621 is a deficient number, since it is larger than the sum of its proper divisors (3715661683).

66039668621 is a wasteful number, since it uses less digits than its factorization.

66039668621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49542211.

The product of its (nonzero) digits is 3359232, while the sum is 53.

The spelling of 66039668621 in words is "sixty-six billion, thirty-nine million, six hundred sixty-eight thousand, six hundred twenty-one".