19802308851 has 24 divisors (see below), whose sum is σ = 30808814400. Its totient is φ = 12183970176.

The previous prime is 19802308837. The next prime is 19802308861. The reversal of 19802308851 is 15880320891.

It is a happy number.

It is not a de Polignac number, because 19802308851 - 2⁵ = 19802308819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19802308797 and 19802308806.

It is not an unprimeable number, because it can be changed into a prime (19802308861) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 960550 + ... + 980948.

It is an arithmetic number, because the mean of its divisors is an integer number (1283700600).

Almost surely, 2^19802308851 is an apocalyptic number.

19802308851 is a deficient number, since it is larger than the sum of its proper divisors (11006505549).

19802308851 is a wasteful number, since it uses less digits than its factorization.

19802308851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28715 (or 28712 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The spelling of 19802308851 in words is "nineteen billion, eight hundred two million, three hundred eight thousand, eight hundred fifty-one".