19798546665 has 8 divisors (see below), whose sum is σ = 31677674688. Its totient is φ = 10559224880.

The previous prime is 19798546661. The next prime is 19798546667. The reversal of 19798546665 is 56664589791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19798546665 - 2² = 19798546661 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19798546596 and 19798546605.

It is not an unprimeable number, because it can be changed into a prime (19798546661) 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 7 ways as a sum of consecutive naturals, for example, 659951541 + ... + 659951570.

It is an arithmetic number, because the mean of its divisors is an integer number (3959709336).

Almost surely, 2^19798546665 is an apocalyptic number.

19798546665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19798546665 is a deficient number, since it is larger than the sum of its proper divisors (11879128023).

19798546665 is a wasteful number, since it uses less digits than its factorization.

19798546665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1319903119.

The product of its digits is 97977600, while the sum is 66.

It can be divided in two parts, 197985 and 46665, that added together give a triangular number (244650 = T₆₉₉).

The spelling of 19798546665 in words is "nineteen billion, seven hundred ninety-eight million, five hundred forty-six thousand, six hundred sixty-five".