19419439668 has 96 divisors (see below), whose sum is σ = 49425868800. Its totient is φ = 5913782784.

The previous prime is 19419439657. The next prime is 19419439723. The reversal of 19419439668 is 86693491491.

It is a super-2 number, since 2×19419439668² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 761980 + ... + 787052.

It is an arithmetic number, because the mean of its divisors is an integer number (514852800).

Almost surely, 2^19419439668 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19419439668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24712934400).

19419439668 is an abundant number, since it is smaller than the sum of its proper divisors (30006429132).

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

19419439668 is a wasteful number, since it uses less digits than its factorization.

19419439668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25221 (or 25219 counting only the distinct ones).

The product of its digits is 10077696, while the sum is 60.

The spelling of 19419439668 in words is "nineteen billion, four hundred nineteen million, four hundred thirty-nine thousand, six hundred sixty-eight".