71665376771 has 4 divisors (see below), whose sum is σ = 72361157232. Its totient is φ = 70969596312.

The previous prime is 71665376759. The next prime is 71665376773. The reversal of 71665376771 is 17767356617.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71665376771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71665376773) 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 3 ways as a sum of consecutive naturals, for example, 347890076 + ... + 347890281.

It is an arithmetic number, because the mean of its divisors is an integer number (18090289308).

Almost surely, 2^71665376771 is an apocalyptic number.

71665376771 is a deficient number, since it is larger than the sum of its proper divisors (695780461).

71665376771 is a wasteful number, since it uses less digits than its factorization.

71665376771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695780460.

The product of its digits is 7779240, while the sum is 56.

The spelling of 71665376771 in words is "seventy-one billion, six hundred sixty-five million, three hundred seventy-six thousand, seven hundred seventy-one".