19868486891 has 24 divisors (see below), whose sum is σ = 23160226320. Its totient is φ = 16972820480.

The previous prime is 19868486867. The next prime is 19868486917.

19868486891 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 19868486891 - 2³⁴ = 2688617707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19868486831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1348235 + ... + 1362891.

It is an arithmetic number, because the mean of its divisors is an integer number (965009430).

Almost surely, 2^19868486891 is an apocalyptic number.

19868486891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19868486891 is a deficient number, since it is larger than the sum of its proper divisors (3291739429).

19868486891 is a wasteful number, since it uses less digits than its factorization.

19868486891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15355 (or 15344 counting only the distinct ones).

The product of its digits is 47775744, while the sum is 68.

The spelling of 19868486891 in words is "nineteen billion, eight hundred sixty-eight million, four hundred eighty-six thousand, eight hundred ninety-one".