19195077805 has 4 divisors (see below), whose sum is σ = 23034093372. Its totient is φ = 15356062240.

The previous prime is 19195077793. The next prime is 19195077821. The reversal of 19195077805 is 50877059191.

It is a happy number.

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 11754462724 + 7440615081 = 108418^2 + 86259^2 .

It is not a de Polignac number, because 19195077805 - 2²⁹ = 18658206893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1919507776 + ... + 1919507785.

It is an arithmetic number, because the mean of its divisors is an integer number (5758523343).

Almost surely, 2^19195077805 is an apocalyptic number.

It is an amenable number.

19195077805 is a deficient number, since it is larger than the sum of its proper divisors (3839015567).

19195077805 is an equidigital number, since it uses as much as digits as its factorization.

19195077805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3839015566.

The product of its (nonzero) digits is 793800, while the sum is 52.

The spelling of 19195077805 in words is "nineteen billion, one hundred ninety-five million, seventy-seven thousand, eight hundred five".