19688105653 has 4 divisors (see below), whose sum is σ = 20724321760. Its totient is φ = 18651889548.

The previous prime is 19688105651. The next prime is 19688105663. The reversal of 19688105653 is 35650188691.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19688105653 - 2¹ = 19688105651 is a prime.

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 19688105653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19688105651) 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, 518108025 + ... + 518108062.

It is an arithmetic number, because the mean of its divisors is an integer number (5181080440).

Almost surely, 2^19688105653 is an apocalyptic number.

It is an amenable number.

19688105653 is a deficient number, since it is larger than the sum of its proper divisors (1036216107).

19688105653 is a wasteful number, since it uses less digits than its factorization.

19688105653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1036216106.

The product of its (nonzero) digits is 1555200, while the sum is 52.

The spelling of 19688105653 in words is "nineteen billion, six hundred eighty-eight million, one hundred five thousand, six hundred fifty-three".