66517671566 has 16 divisors (see below), whose sum is σ = 100096214400. Its totient is φ = 33152329080.

The previous prime is 66517671547. The next prime is 66517671569.

66517671566 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66517671569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2422985 + ... + 2450283.

It is an arithmetic number, because the mean of its divisors is an integer number (6256013400).

Almost surely, 2^66517671566 is an apocalyptic number.

66517671566 is a deficient number, since it is larger than the sum of its proper divisors (33578542834).

66517671566 is a wasteful number, since it uses less digits than its factorization.

66517671566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31159.

The product of its digits is 9525600, while the sum is 56.

The spelling of 66517671566 in words is "sixty-six billion, five hundred seventeen million, six hundred seventy-one thousand, five hundred sixty-six".