19859085892 has 24 divisors (see below), whose sum is σ = 35052091200. Its totient is φ = 9844524576.

The previous prime is 19859085859. The next prime is 19859085973. The reversal of 19859085892 is 29858095891.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208459 + ... + 288397.

It is an arithmetic number, because the mean of its divisors is an integer number (1460503800).

Almost surely, 2^19859085892 is an apocalyptic number.

It is an amenable number.

19859085892 is a deficient number, since it is larger than the sum of its proper divisors (15193005308).

19859085892 is a wasteful number, since it uses less digits than its factorization.

19859085892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80475 (or 80473 counting only the distinct ones).

The product of its (nonzero) digits is 18662400, while the sum is 64.

Subtracting 19859085892 from its reverse (29858095891), we obtain a palindrome (9999009999).

It can be divided in two parts, 198590 and 85892, that added together give a palindrome (284482).

The spelling of 19859085892 in words is "nineteen billion, eight hundred fifty-nine million, eighty-five thousand, eight hundred ninety-two".