71684548391 has 16 divisors (see below), whose sum is σ = 75417568800. Its totient is φ = 68036976000.

The previous prime is 71684548381. The next prime is 71684548409. The reversal of 71684548391 is 19384548617.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71684548391 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 (71684548321) 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 15 ways as a sum of consecutive naturals, for example, 3153416 + ... + 3176066.

It is an arithmetic number, because the mean of its divisors is an integer number (4713598050).

Almost surely, 2^71684548391 is an apocalyptic number.

71684548391 is a deficient number, since it is larger than the sum of its proper divisors (3733020409).

71684548391 is a wasteful number, since it uses less digits than its factorization.

71684548391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24530.

The product of its digits is 5806080, while the sum is 56.

The spelling of 71684548391 in words is "seventy-one billion, six hundred eighty-four million, five hundred forty-eight thousand, three hundred ninety-one".