19687771369 has 16 divisors (see below), whose sum is σ = 23232311296. Its totient is φ = 16326522000.

The previous prime is 19687771351. The next prime is 19687771379. The reversal of 19687771369 is 96317778691.

It is not a de Polignac number, because 19687771369 - 2⁹ = 19687770857 is a prime.

It is a super-2 number, since 2×19687771369² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19687771369.

It is not an unprimeable number, because it can be changed into a prime (19687771309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 999514 + ... + 1019020.

It is an arithmetic number, because the mean of its divisors is an integer number (1452019456).

Almost surely, 2^19687771369 is an apocalyptic number.

It is an amenable number.

19687771369 is a deficient number, since it is larger than the sum of its proper divisors (3544539927).

19687771369 is a wasteful number, since it uses less digits than its factorization.

19687771369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24196.

The product of its digits is 24004512, while the sum is 64.

The spelling of 19687771369 in words is "nineteen billion, six hundred eighty-seven million, seven hundred seventy-one thousand, three hundred sixty-nine".