87991185818799 has 12 divisors (see below), whose sum is σ = 127255097627112. Its totient is φ = 58588459110000.

The previous prime is 87991185818797. The next prime is 87991185818803. The reversal of 87991185818799 is 99781858119978.

87991185818799 is a `hidden beast` number, since 8 + 7 + 9 + 9 + 1 + 18 + 581 + 8 + 7 + 9 + 9 = 666.

It is not a de Polignac number, because 87991185818799 - 2¹ = 87991185818797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87991185818797) 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 11 ways as a sum of consecutive naturals, for example, 6027611952 + ... + 6027626549.

It is an arithmetic number, because the mean of its divisors is an integer number (10604591468926).

Almost surely, 2^{87991185818799} is an apocalyptic number.

87991185818799 is a deficient number, since it is larger than the sum of its proper divisors (39263911808313).

87991185818799 is a wasteful number, since it uses less digits than its factorization.

87991185818799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12055239318 (or 12055239315 counting only the distinct ones).

The product of its digits is 6584094720, while the sum is 90.

The spelling of 87991185818799 in words is "eighty-seven trillion, nine hundred ninety-one billion, one hundred eighty-five million, eight hundred eighteen thousand, seven hundred ninety-nine".