19591118808 has 32 divisors (see below), whose sum is σ = 49567896000. Its totient is φ = 6451693088.

The previous prime is 19591118797. The next prime is 19591118837. The reversal of 19591118808 is 80881119591.

It is a happy number.

It is a super-2 number, since 2×19591118808² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4915458 + ... + 4919441.

It is an arithmetic number, because the mean of its divisors is an integer number (1548996750).

Almost surely, 2^19591118808 is an apocalyptic number.

It is an amenable number.

19591118808 is an abundant number, since it is smaller than the sum of its proper divisors (29976777192).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19591118808 is a wasteful number, since it uses less digits than its factorization.

19591118808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9834991 (or 9834987 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 51.

The spelling of 19591118808 in words is "nineteen billion, five hundred ninety-one million, one hundred eighteen thousand, eight hundred eight".