19739238865 has 16 divisors (see below), whose sum is σ = 24050714688. Its totient is φ = 15550214976.

The previous prime is 19739238859. The next prime is 19739238913. The reversal of 19739238865 is 56883293791.

It is a cyclic number.

It is not a de Polignac number, because 19739238865 - 2⁹ = 19739238353 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49939 + ... + 204871.

It is an arithmetic number, because the mean of its divisors is an integer number (1503169668).

Almost surely, 2^19739238865 is an apocalyptic number.

It is an amenable number.

19739238865 is a deficient number, since it is larger than the sum of its proper divisors (4311475823).

19739238865 is a wasteful number, since it uses less digits than its factorization.

19739238865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155328.

The product of its digits is 19595520, while the sum is 61.

The spelling of 19739238865 in words is "nineteen billion, seven hundred thirty-nine million, two hundred thirty-eight thousand, eight hundred sixty-five".