91768439999 has 8 divisors (see below), whose sum is σ = 92170320768. Its totient is φ = 91367266720.

The previous prime is 91768439909. The next prime is 91768440011. The reversal of 91768439999 is 99993486719.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91768439999 - 2¹² = 91768435903 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 (91768439909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83954 + ... + 436560.

It is an arithmetic number, because the mean of its divisors is an integer number (11521290096).

Almost surely, 2^91768439999 is an apocalyptic number.

91768439999 is a deficient number, since it is larger than the sum of its proper divisors (401880769).

91768439999 is a wasteful number, since it uses less digits than its factorization.

91768439999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353745.

The product of its digits is 238085568, while the sum is 74.

The spelling of 91768439999 in words is "ninety-one billion, seven hundred sixty-eight million, four hundred thirty-nine thousand, nine hundred ninety-nine".