19019797648 has 20 divisors (see below), whose sum is σ = 36854248320. Its totient is φ = 9509023904.

The previous prime is 19019797613. The next prime is 19019797649. The reversal of 19019797648 is 84679791091.

It is not an unprimeable number, because it can be changed into a prime (19019797649) 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, 147261 + ... + 244387.

It is an arithmetic number, because the mean of its divisors is an integer number (1842712416).

Almost surely, 2^19019797648 is an apocalyptic number.

It is an amenable number.

19019797648 is a deficient number, since it is larger than the sum of its proper divisors (17834450672).

19019797648 is a wasteful number, since it uses less digits than its factorization.

19019797648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109374 (or 109368 counting only the distinct ones).

The product of its (nonzero) digits is 6858432, while the sum is 61.

The spelling of 19019797648 in words is "nineteen billion, nineteen million, seven hundred ninety-seven thousand, six hundred forty-eight".