19902475008 has 720 divisors, whose sum is σ = 69929377056. Its totient is φ = 5573836800.

The previous prime is 19902475003. The next prime is 19902475037. The reversal of 19902475008 is 80057420991.

19902475008 is a `hidden beast` number, since 19 + 90 + 2 + 47 + 500 + 8 = 666.

It is a super-2 number, since 2×19902475008² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19902475003) by changing a digit.

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 79 ways as a sum of consecutive naturals, for example, 197054158 + ... + 197054258.

Almost surely, 2^19902475008 is an apocalyptic number.

19902475008 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19902475008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34964688528).

19902475008 is an abundant number, since it is smaller than the sum of its proper divisors (50026902048).

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

19902475008 is a wasteful number, since it uses less digits than its factorization.

19902475008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

Adding to 19902475008 its reverse (80057420991), we get a palindrome (99959895999).

The spelling of 19902475008 in words is "nineteen billion, nine hundred two million, four hundred seventy-five thousand, eight".