19917216624 has 40 divisors (see below), whose sum is σ = 52843430800. Its totient is φ = 6459637248.

The previous prime is 19917216601. The next prime is 19917216701. The reversal of 19917216624 is 42661271991.

It is a happy number.

It is a super-4 number, since 4×19917216624⁴ (a number of 42 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5605549 + ... + 5609100.

It is an arithmetic number, because the mean of its divisors is an integer number (1321085770).

Almost surely, 2^19917216624 is an apocalyptic number.

It is an amenable number.

19917216624 is an abundant number, since it is smaller than the sum of its proper divisors (32926214176).

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

19917216624 is a wasteful number, since it uses less digits than its factorization.

19917216624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11214697 (or 11214691 counting only the distinct ones).

The product of its digits is 326592, while the sum is 48.

The spelling of 19917216624 in words is "nineteen billion, nine hundred seventeen million, two hundred sixteen thousand, six hundred twenty-four".