19384887065 has 4 divisors (see below), whose sum is σ = 23261864484. Its totient is φ = 15507909648.

The previous prime is 19384887019. The next prime is 19384887097. The reversal of 19384887065 is 56078848391.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56078848391 = 293 ⋅191395387.

It can be written as a sum of positive squares in 2 ways, for example, as 9524198464 + 9860688601 = 97592^2 + 99301^2 .

It is a cyclic number.

It is not a de Polignac number, because 19384887065 - 2⁸ = 19384886809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19384886995 and 19384887013.

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, 1938488702 + ... + 1938488711.

It is an arithmetic number, because the mean of its divisors is an integer number (5815466121).

Almost surely, 2^19384887065 is an apocalyptic number.

It is an amenable number.

19384887065 is a deficient number, since it is larger than the sum of its proper divisors (3876977419).

19384887065 is an equidigital number, since it uses as much as digits as its factorization.

19384887065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3876977418.

The product of its (nonzero) digits is 11612160, while the sum is 59.

The spelling of 19384887065 in words is "nineteen billion, three hundred eighty-four million, eight hundred eighty-seven thousand, sixty-five".