19790797989 has 8 divisors (see below), whose sum is σ = 26461235520. Its totient is φ = 13157112896.

The previous prime is 19790797981. The next prime is 19790797991. The reversal of 19790797989 is 98979709791.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 19790797989 - 2³ = 19790797981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19790797989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19790797981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9186852 + ... + 9189005.

It is an arithmetic number, because the mean of its divisors is an integer number (3307654440).

Almost surely, 2^19790797989 is an apocalyptic number.

It is an amenable number.

19790797989 is a deficient number, since it is larger than the sum of its proper divisors (6670437531).

19790797989 is a wasteful number, since it uses less digits than its factorization.

19790797989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18376219.

The product of its (nonzero) digits is 162030456, while the sum is 75.

The spelling of 19790797989 in words is "nineteen billion, seven hundred ninety million, seven hundred ninety-seven thousand, nine hundred eighty-nine".