104019551991 has 24 divisors (see below), whose sum is σ = 161020485600. Its totient is φ = 64538565696.

The previous prime is 104019551939. The next prime is 104019552041. The reversal of 104019551991 is 199155910401.

It is a happy number.

104019551991 is a `hidden beast` number, since 1 + 0 + 4 + 0 + 1 + 9 + 551 + 9 + 91 = 666.

It is not a de Polignac number, because 104019551991 - 2⁷ = 104019551863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (104019551191) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6783016 + ... + 6798333.

It is an arithmetic number, because the mean of its divisors is an integer number (6709186900).

Almost surely, 2^104019551991 is an apocalyptic number.

104019551991 is a deficient number, since it is larger than the sum of its proper divisors (57000933609).

104019551991 is a wasteful number, since it uses less digits than its factorization.

104019551991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13581415 (or 13581412 counting only the distinct ones).

The product of its (nonzero) digits is 72900, while the sum is 45.

The spelling of 104019551991 in words is "one hundred four billion, nineteen million, five hundred fifty-one thousand, nine hundred ninety-one".