19475039808 has 252 divisors, whose sum is σ = 65673511020. Its totient is φ = 5501067264.

The previous prime is 19475039807. The next prime is 19475039851. The reversal of 19475039808 is 80893057491.

19475039808 is a `hidden beast` number, since 1 + 9 + 47 + 503 + 98 + 0 + 8 = 666.

It is a Cunningham number, because it is equal to 139553²-1.

It can be written as a sum of positive squares in 2 ways, for example, as 13398525504 + 6076514304 = 115752^2 + 77952^2 .

It is a tau number, because it is divible by the number of its divisors (252).

It is not an unprimeable number, because it can be changed into a prime (19475039807) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2508060 + ... + 2515812.

Almost surely, 2^19475039808 is an apocalyptic number.

19475039808 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 19475039808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32836755510).

19475039808 is an abundant number, since it is smaller than the sum of its proper divisors (46198471212).

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

19475039808 is a wasteful number, since it uses less digits than its factorization.

19475039808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7874 (or 7854 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 19475039808 in words is "nineteen billion, four hundred seventy-five million, thirty-nine thousand, eight hundred eight".