66193564871 has 6 divisors (see below), whose sum is σ = 77000677560. Its totient is φ = 56737341276.

The previous prime is 66193564823. The next prime is 66193564873. The reversal of 66193564871 is 17846539166.

It is not a de Polignac number, because 66193564871 - 2²⁶ = 66126456007 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 (66193564873) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 675444491 + ... + 675444588.

It is an arithmetic number, because the mean of its divisors is an integer number (12833446260).

Almost surely, 2^66193564871 is an apocalyptic number.

66193564871 is a deficient number, since it is larger than the sum of its proper divisors (10807112689).

66193564871 is a wasteful number, since it uses less digits than its factorization.

66193564871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1350889093 (or 1350889086 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 56.

The spelling of 66193564871 in words is "sixty-six billion, one hundred ninety-three million, five hundred sixty-four thousand, eight hundred seventy-one".