19348678865 has 4 divisors (see below), whose sum is σ = 23218414644. Its totient is φ = 15478943088.

The previous prime is 19348678849. The next prime is 19348678871. The reversal of 19348678865 is 56887684391.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5788775056 + 13559903809 = 76084^2 + 116447^2 .

It is a cyclic number.

It is not a de Polignac number, because 19348678865 - 2⁴ = 19348678849 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1934867882 + ... + 1934867891.

It is an arithmetic number, because the mean of its divisors is an integer number (5804603661).

Almost surely, 2^19348678865 is an apocalyptic number.

It is an amenable number.

19348678865 is a deficient number, since it is larger than the sum of its proper divisors (3869735779).

19348678865 is an equidigital number, since it uses as much as digits as its factorization.

19348678865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3869735778.

The product of its digits is 69672960, while the sum is 65.

The spelling of 19348678865 in words is "nineteen billion, three hundred forty-eight million, six hundred seventy-eight thousand, eight hundred sixty-five".