19118212165 has 8 divisors (see below), whose sum is σ = 24706612728. Its totient is φ = 14118064320.

The previous prime is 19118212163. The next prime is 19118212171. The reversal of 19118212165 is 56121281191.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2552977729 + 16565234436 = 50527^2 + 128706^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19118212165 - 2¹ = 19118212163 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19118212163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147063106 + ... + 147063235.

It is an arithmetic number, because the mean of its divisors is an integer number (3088326591).

Almost surely, 2^19118212165 is an apocalyptic number.

It is an amenable number.

19118212165 is a deficient number, since it is larger than the sum of its proper divisors (5588400563).

19118212165 is a wasteful number, since it uses less digits than its factorization.

19118212165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294126359.

The product of its digits is 8640, while the sum is 37.

The spelling of 19118212165 in words is "nineteen billion, one hundred eighteen million, two hundred twelve thousand, one hundred sixty-five".