66943634966 has 16 divisors (see below), whose sum is σ = 108315010944. Its totient is φ = 30846978624.

The previous prime is 66943634963. The next prime is 66943634983.

It is a happy number.

66943634966 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×66943634966² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66943634899 and 66943634908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66943634963) 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, 2070470 + ... + 2102553.

It is an arithmetic number, because the mean of its divisors is an integer number (6769688184).

Almost surely, 2^66943634966 is an apocalyptic number.

66943634966 is a deficient number, since it is larger than the sum of its proper divisors (41371375978).

66943634966 is a wasteful number, since it uses less digits than its factorization.

66943634966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4173655.

The product of its digits is 90699264, while the sum is 62.

The spelling of 66943634966 in words is "sixty-six billion, nine hundred forty-three million, six hundred thirty-four thousand, nine hundred sixty-six".