19747219497 has 8 divisors (see below), whose sum is σ = 26330660256. Its totient is φ = 13164295872.

The previous prime is 19747219493. The next prime is 19747219537. The reversal of 19747219497 is 79491274791.

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

It is not a de Polignac number, because 19747219497 - 2² = 19747219493 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 19747219497.

It is not an unprimeable number, because it can be changed into a prime (19747219493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29088 + ... + 200849.

It is an arithmetic number, because the mean of its divisors is an integer number (3291332532).

Almost surely, 2^19747219497 is an apocalyptic number.

It is an amenable number.

19747219497 is a deficient number, since it is larger than the sum of its proper divisors (6583440759).

19747219497 is a wasteful number, since it uses less digits than its factorization.

19747219497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258567.

The product of its digits is 8001504, while the sum is 60.

The spelling of 19747219497 in words is "nineteen billion, seven hundred forty-seven million, two hundred nineteen thousand, four hundred ninety-seven".