19479911369 has 4 divisors (see below), whose sum is σ = 19480311444. Its totient is φ = 19479511296.

The previous prime is 19479911323. The next prime is 19479911389. The reversal of 19479911369 is 96311997491.

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 15373024144 + 4106887225 = 123988^2 + 64085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19479911369 is a prime.

It is a super-2 number, since 2×19479911369² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19479911389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114932 + ... + 228405.

It is an arithmetic number, because the mean of its divisors is an integer number (4870077861).

Almost surely, 2^19479911369 is an apocalyptic number.

It is an amenable number.

19479911369 is a deficient number, since it is larger than the sum of its proper divisors (400075).

19479911369 is an equidigital number, since it uses as much as digits as its factorization.

19479911369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400074.

The product of its digits is 3306744, while the sum is 59.

The spelling of 19479911369 in words is "nineteen billion, four hundred seventy-nine million, nine hundred eleven thousand, three hundred sixty-nine".