19856793663 has 36 divisors (see below), whose sum is σ = 34266596520. Its totient is φ = 11040061536.

The previous prime is 19856793653. The next prime is 19856793703. The reversal of 19856793663 is 36639765891.

19856793663 is a `hidden beast` number, since 1 + 9 + 8 + 567 + 9 + 3 + 6 + 63 = 666.

It is not a de Polignac number, because 19856793663 - 2⁴ = 19856793647 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 19856793663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19856793623) 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 35 ways as a sum of consecutive naturals, for example, 592153 + ... + 624786.

Almost surely, 2^19856793663 is an apocalyptic number.

19856793663 is a deficient number, since it is larger than the sum of its proper divisors (14409802857).

19856793663 is a wasteful number, since it uses less digits than its factorization.

19856793663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1216996 (or 1216986 counting only the distinct ones).

The product of its digits is 44089920, while the sum is 63.

It can be divided in two parts, 198567 and 93663, that added together give a triangular number (292230 = T₇₆₄).

The spelling of 19856793663 in words is "nineteen billion, eight hundred fifty-six million, seven hundred ninety-three thousand, six hundred sixty-three".