83891329599 has 192 divisors, whose sum is σ = 152065216512. Its totient is φ = 40590950400.

The previous prime is 83891329589. The next prime is 83891329607. The reversal of 83891329599 is 99592319838.

It is a Cunningham number, because it is equal to 289640²-1.

It is not a de Polignac number, because 83891329599 - 2⁷ = 83891329471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83891329589) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 326425279 + ... + 326425535.

It is an arithmetic number, because the mean of its divisors is an integer number (792006336).

Almost surely, 2^83891329599 is an apocalyptic number.

83891329599 is a deficient number, since it is larger than the sum of its proper divisors (68173886913).

83891329599 is a wasteful number, since it uses less digits than its factorization.

83891329599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506 (or 499 counting only the distinct ones).

The product of its digits is 37791360, while the sum is 66.

The spelling of 83891329599 in words is "eighty-three billion, eight hundred ninety-one million, three hundred twenty-nine thousand, five hundred ninety-nine".