19623512816 has 20 divisors (see below), whose sum is σ = 40021638600. Its totient is φ = 9295348032.

The previous prime is 19623512813. The next prime is 19623512851. The reversal of 19623512816 is 61821532691.

It is a happy number.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19623512813) 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, 32275211 + ... + 32275818.

It is an arithmetic number, because the mean of its divisors is an integer number (2001081930).

Almost surely, 2^19623512816 is an apocalyptic number.

19623512816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19623512816 is an abundant number, since it is smaller than the sum of its proper divisors (20398125784).

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

19623512816 is a wasteful number, since it uses less digits than its factorization.

19623512816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64551056 (or 64551050 counting only the distinct ones).

The product of its digits is 155520, while the sum is 44.

The spelling of 19623512816 in words is "nineteen billion, six hundred twenty-three million, five hundred twelve thousand, eight hundred sixteen".