19109936464 has 20 divisors (see below), whose sum is σ = 37163151540. Its totient is φ = 9519445760.

The previous prime is 19109936441. The next prime is 19109936477. The reversal of 19109936464 is 46463990191.

It can be written as a sum of positive squares in 2 ways, for example, as 10984716864 + 8125219600 = 104808^2 + 90140^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2215717 + ... + 2224324.

It is an arithmetic number, because the mean of its divisors is an integer number (1858157577).

Almost surely, 2^19109936464 is an apocalyptic number.

It is an amenable number.

19109936464 is a deficient number, since it is larger than the sum of its proper divisors (18053215076).

19109936464 is a wasteful number, since it uses less digits than its factorization.

19109936464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4440318 (or 4440312 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 52.

The spelling of 19109936464 in words is "nineteen billion, one hundred nine million, nine hundred thirty-six thousand, four hundred sixty-four".