71881587685 has 16 divisors (see below), whose sum is σ = 88122839040. Its totient is φ = 56274865920.

The previous prime is 71881587671. The next prime is 71881587689. The reversal of 71881587685 is 58678518817.

It is not a de Polignac number, because 71881587685 - 2¹⁵ = 71881554917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71881587689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 760581 + ... + 849850.

It is an arithmetic number, because the mean of its divisors is an integer number (5507677440).

Almost surely, 2^71881587685 is an apocalyptic number.

It is an amenable number.

71881587685 is a deficient number, since it is larger than the sum of its proper divisors (16241251355).

71881587685 is a wasteful number, since it uses less digits than its factorization.

71881587685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1610628.

The product of its digits is 30105600, while the sum is 64.

The spelling of 71881587685 in words is "seventy-one billion, eight hundred eighty-one million, five hundred eighty-seven thousand, six hundred eighty-five".