19838420065 has 32 divisors (see below), whose sum is σ = 24254588160. Its totient is φ = 15575426304.

The previous prime is 19838420059. The next prime is 19838420093. The reversal of 19838420065 is 56002483891.

It is a cyclic number.

It is not a de Polignac number, because 19838420065 - 2¹⁵ = 19838387297 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19838419997 and 19838420024.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38975031 + ... + 38975539.

It is an arithmetic number, because the mean of its divisors is an integer number (757955880).

Almost surely, 2^19838420065 is an apocalyptic number.

It is an amenable number.

19838420065 is a deficient number, since it is larger than the sum of its proper divisors (4416168095).

19838420065 is a wasteful number, since it uses less digits than its factorization.

19838420065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161.

The product of its (nonzero) digits is 414720, while the sum is 46.

The spelling of 19838420065 in words is "nineteen billion, eight hundred thirty-eight million, four hundred twenty thousand, sixty-five".