66353165639 has 8 divisors (see below), whose sum is σ = 66472284528. Its totient is φ = 66234096640.

The previous prime is 66353165629. The next prime is 66353165729. The reversal of 66353165639 is 93656135366.

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

It is a cyclic number.

It is not a de Polignac number, because 66353165639 - 2¹² = 66353161543 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 (66353165609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3520589 + ... + 3539385.

It is an arithmetic number, because the mean of its divisors is an integer number (8309035566).

Almost surely, 2^66353165639 is an apocalyptic number.

66353165639 is a deficient number, since it is larger than the sum of its proper divisors (119118889).

66353165639 is a wasteful number, since it uses less digits than its factorization.

66353165639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24945.

The product of its digits is 7873200, while the sum is 53.

The spelling of 66353165639 in words is "sixty-six billion, three hundred fifty-three million, one hundred sixty-five thousand, six hundred thirty-nine".