19905897066 has 48 divisors (see below), whose sum is σ = 44942836512. Its totient is φ = 5869052640.

The previous prime is 19905897019. The next prime is 19905897071. The reversal of 19905897066 is 66079850991.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 343660 + ... + 397383.

It is an arithmetic number, because the mean of its divisors is an integer number (936309094).

Almost surely, 2^19905897066 is an apocalyptic number.

19905897066 is an abundant number, since it is smaller than the sum of its proper divisors (25036939446).

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

19905897066 is a wasteful number, since it uses less digits than its factorization.

19905897066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741107 (or 741096 counting only the distinct ones).

The product of its (nonzero) digits is 7348320, while the sum is 60.

The spelling of 19905897066 in words is "nineteen billion, nine hundred five million, eight hundred ninety-seven thousand, sixty-six".