65566049999971 has 4 divisors (see below), whose sum is σ = 65571346567000. Its totient is φ = 65560753432944.

The previous prime is 65566049999927. The next prime is 65566049999987. The reversal of 65566049999971 is 17999994066556.

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 65566049999971 - 2²⁷ = 65565915782243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65566049990971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2648264946 + ... + 2648289703.

It is an arithmetic number, because the mean of its divisors is an integer number (16392836641750).

Almost surely, 2^{65566049999971} is an apocalyptic number.

65566049999971 is a deficient number, since it is larger than the sum of its proper divisors (5296567029).

65566049999971 is a wasteful number, since it uses less digits than its factorization.

65566049999971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5296567028.

The product of its (nonzero) digits is 8928208800, while the sum is 85.

The spelling of 65566049999971 in words is "sixty-five trillion, five hundred sixty-six billion, forty-nine million, nine hundred ninety-nine thousand, nine hundred seventy-one".