19523966208 has 144 divisors (see below), whose sum is σ = 54543404160. Its totient is φ = 6188081152.

The previous prime is 19523966207. The next prime is 19523966233. The reversal of 19523966208 is 80266932591.

It is a super-2 number, since 2×19523966208² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19523966207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3052678 + ... + 3059066.

It is an arithmetic number, because the mean of its divisors is an integer number (378773640).

Almost surely, 2^19523966208 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 19523966208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27271702080).

19523966208 is an abundant number, since it is smaller than the sum of its proper divisors (35019437952).

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

19523966208 is a wasteful number, since it uses less digits than its factorization.

19523966208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6604 (or 6590 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 51.

The spelling of 19523966208 in words is "nineteen billion, five hundred twenty-three million, nine hundred sixty-six thousand, two hundred eight".