19191340265 has 4 divisors (see below), whose sum is σ = 23029608324. Its totient is φ = 15353072208.

The previous prime is 19191340247. The next prime is 19191340271. The reversal of 19191340265 is 56204319191.

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 13695786841 + 5495553424 = 117029^2 + 74132^2 .

It is a cyclic number.

It is not a de Polignac number, because 19191340265 - 2¹² = 19191336169 is a prime.

It is a Duffinian 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, 1919134022 + ... + 1919134031.

It is an arithmetic number, because the mean of its divisors is an integer number (5757402081).

Almost surely, 2^19191340265 is an apocalyptic number.

It is an amenable number.

19191340265 is a deficient number, since it is larger than the sum of its proper divisors (3838268059).

19191340265 is an equidigital number, since it uses as much as digits as its factorization.

19191340265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3838268058.

The product of its (nonzero) digits is 58320, while the sum is 41.

The spelling of 19191340265 in words is "nineteen billion, one hundred ninety-one million, three hundred forty thousand, two hundred sixty-five".