83849471991 has 12 divisors (see below), whose sum is σ = 126381813168. Its totient is φ = 53469228384.

The previous prime is 83849471983. The next prime is 83849472013. The reversal of 83849471991 is 19917494838.

83849471991 is a `hidden beast` number, since 8 + 38 + 49 + 471 + 9 + 91 = 666.

It is not a de Polignac number, because 83849471991 - 2³ = 83849471983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83849471921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 202534750 + ... + 202535163.

It is an arithmetic number, because the mean of its divisors is an integer number (10531817764).

Almost surely, 2^83849471991 is an apocalyptic number.

83849471991 is a deficient number, since it is larger than the sum of its proper divisors (42532341177).

83849471991 is a wasteful number, since it uses less digits than its factorization.

83849471991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405069942 (or 405069939 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 63.

The spelling of 83849471991 in words is "eighty-three billion, eight hundred forty-nine million, four hundred seventy-one thousand, nine hundred ninety-one".