71666276897 has 4 divisors (see below), whose sum is σ = 71987650560. Its totient is φ = 71344903236.

The previous prime is 71666276849. The next prime is 71666276971. The reversal of 71666276897 is 79867266617.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71666276897 - 2¹⁰ = 71666275873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71666279897) 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, 160686497 + ... + 160686942.

It is an arithmetic number, because the mean of its divisors is an integer number (17996912640).

Almost surely, 2^71666276897 is an apocalyptic number.

It is an amenable number.

71666276897 is a deficient number, since it is larger than the sum of its proper divisors (321373663).

71666276897 is a wasteful number, since it uses less digits than its factorization.

71666276897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321373662.

The product of its digits is 64012032, while the sum is 65.

The spelling of 71666276897 in words is "seventy-one billion, six hundred sixty-six million, two hundred seventy-six thousand, eight hundred ninety-seven".