19816530768 has 100 divisors (see below), whose sum is σ = 59205063808. Its totient is φ = 6392416320.

The previous prime is 19816530751. The next prime is 19816530817. The reversal of 19816530768 is 86703561891.

19816530768 is a `hidden beast` number, since 1 + 98 + 16 + 530 + 7 + 6 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 206446 + ... + 286797.

Almost surely, 2^19816530768 is an apocalyptic number.

19816530768 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19816530768 is an abundant number, since it is smaller than the sum of its proper divisors (39388533040).

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

19816530768 is a wasteful number, since it uses less digits than its factorization.

19816530768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493294 (or 493279 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 19816530768 in words is "nineteen billion, eight hundred sixteen million, five hundred thirty thousand, seven hundred sixty-eight".