71866737827 has 4 divisors (see below), whose sum is σ = 71870503776. Its totient is φ = 71862971880.

The previous prime is 71866737821. The next prime is 71866737829. The reversal of 71866737827 is 72873766817.

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 71866737827 - 2¹⁰ = 71866736803 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71866737827.

It is not an unprimeable number, because it can be changed into a prime (71866737821) 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, 1854203 + ... + 1892564.

It is an arithmetic number, because the mean of its divisors is an integer number (17967625944).

Almost surely, 2^71866737827 is an apocalyptic number.

71866737827 is a deficient number, since it is larger than the sum of its proper divisors (3765949).

71866737827 is a wasteful number, since it uses less digits than its factorization.

71866737827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3765948.

The product of its digits is 33191424, while the sum is 62.

The spelling of 71866737827 in words is "seventy-one billion, eight hundred sixty-six million, seven hundred thirty-seven thousand, eight hundred twenty-seven".