19910805486 has 64 divisors (see below), whose sum is σ = 48047924736. Its totient is φ = 5418921600.

The previous prime is 19910805443. The next prime is 19910805493. The reversal of 19910805486 is 68450801991.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 281850 + ... + 345341.

It is an arithmetic number, because the mean of its divisors is an integer number (750748824).

Almost surely, 2^19910805486 is an apocalyptic number.

19910805486 is an abundant number, since it is smaller than the sum of its proper divisors (28137119250).

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

19910805486 is a wasteful number, since it uses less digits than its factorization.

19910805486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627257.

The product of its (nonzero) digits is 622080, while the sum is 51.

The spelling of 19910805486 in words is "nineteen billion, nine hundred ten million, eight hundred five thousand, four hundred eighty-six".