19798898761 has 4 divisors (see below), whose sum is σ = 19908285124. Its totient is φ = 19689512400.

The previous prime is 19798898753. The next prime is 19798898773. The reversal of 19798898761 is 16789889791.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9028610361 + 10770288400 = 95019^2 + 103780^2 .

It is a cyclic number.

It is not a de Polignac number, because 19798898761 - 2³ = 19798898753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19798898701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54692910 + ... + 54693271.

It is an arithmetic number, because the mean of its divisors is an integer number (4977071281).

Almost surely, 2^19798898761 is an apocalyptic number.

It is an amenable number.

19798898761 is a deficient number, since it is larger than the sum of its proper divisors (109386363).

19798898761 is a wasteful number, since it uses less digits than its factorization.

19798898761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109386362.

The product of its digits is 109734912, while the sum is 73.

The spelling of 19798898761 in words is "nineteen billion, seven hundred ninety-eight million, eight hundred ninety-eight thousand, seven hundred sixty-one".