19655904518 has 16 divisors (see below), whose sum is σ = 29900949120. Its totient is φ = 9689040576.

The previous prime is 19655904517. The next prime is 19655904533. The reversal of 19655904518 is 81540955691.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19655904518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19655904517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 315563 + ... + 372681.

It is an arithmetic number, because the mean of its divisors is an integer number (1868809320).

Almost surely, 2^19655904518 is an apocalyptic number.

19655904518 is a deficient number, since it is larger than the sum of its proper divisors (10245044602).

19655904518 is a wasteful number, since it uses less digits than its factorization.

19655904518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59551.

The product of its (nonzero) digits is 1944000, while the sum is 53.

The spelling of 19655904518 in words is "nineteen billion, six hundred fifty-five million, nine hundred four thousand, five hundred eighteen".