19654311768 has 128 divisors (see below), whose sum is σ = 60625420800. Its totient is φ = 5170646016.

The previous prime is 19654311757. The next prime is 19654311841. The reversal of 19654311768 is 86711345691.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 19654311768.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 882255 + ... + 904257.

It is an arithmetic number, because the mean of its divisors is an integer number (473636100).

Almost surely, 2^19654311768 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19654311768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30312710400).

19654311768 is an abundant number, since it is smaller than the sum of its proper divisors (40971109032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19654311768 is a wasteful number, since it uses less digits than its factorization.

19654311768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22441 (or 22437 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 51.

The spelling of 19654311768 in words is "nineteen billion, six hundred fifty-four million, three hundred eleven thousand, seven hundred sixty-eight".