66993822165799 has 4 divisors (see below), whose sum is σ = 67012582690840. Its totient is φ = 66975061640760.

The previous prime is 66993822165793. The next prime is 66993822165839. The reversal of 66993822165799 is 99756122839966.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66993822165799 - 2¹⁵ = 66993822133031 is a prime.

It is a super-3 number, since 3×66993822165799³ (a number of 42 digits) contains 333 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 (66993822165793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9380257164 + ... + 9380264305.

It is an arithmetic number, because the mean of its divisors is an integer number (16753145672710).

Almost surely, 2^{66993822165799} is an apocalyptic number.

66993822165799 is a deficient number, since it is larger than the sum of its proper divisors (18760525041).

66993822165799 is a wasteful number, since it uses less digits than its factorization.

66993822165799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18760525040.

The product of its digits is 4761711360, while the sum is 82.

The spelling of 66993822165799 in words is "sixty-six trillion, nine hundred ninety-three billion, eight hundred twenty-two million, one hundred sixty-five thousand, seven hundred ninety-nine".