19408788081 has 16 divisors (see below), whose sum is σ = 28980172800. Its totient is φ = 12837306384.

The previous prime is 19408788071. The next prime is 19408788107. The reversal of 19408788081 is 18088780491.

It is a happy number.

19408788081 is a `hidden beast` number, since 19 + 408 + 78 + 80 + 81 = 666.

It is not a de Polignac number, because 19408788081 - 2²¹ = 19406690929 is a prime.

It is a super-2 number, since 2×19408788081² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19408788011) 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, 2826666 + ... + 2833523.

It is an arithmetic number, because the mean of its divisors is an integer number (1811260800).

Almost surely, 2^19408788081 is an apocalyptic number.

It is an amenable number.

19408788081 is a deficient number, since it is larger than the sum of its proper divisors (9571384719).

19408788081 is a wasteful number, since it uses less digits than its factorization.

19408788081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5660325 (or 5660319 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 54.

The spelling of 19408788081 in words is "nineteen billion, four hundred eight million, seven hundred eighty-eight thousand, eighty-one".