19348861811 has 4 divisors (see below), whose sum is σ = 19581980712. Its totient is φ = 19115742912.

The previous prime is 19348861783. The next prime is 19348861843. The reversal of 19348861811 is 11816884391.

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: 11816884391 = 13 ⋅908991107.

It is a cyclic number.

It is not a de Polignac number, because 19348861811 - 2¹⁸ = 19348599667 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19348861811.

It is not an unprimeable number, because it can be changed into a prime (19348861111) 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, 116559326 + ... + 116559491.

It is an arithmetic number, because the mean of its divisors is an integer number (4895495178).

Almost surely, 2^19348861811 is an apocalyptic number.

19348861811 is a deficient number, since it is larger than the sum of its proper divisors (233118901).

19348861811 is an equidigital number, since it uses as much as digits as its factorization.

19348861811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233118900.

The product of its digits is 331776, while the sum is 50.

The spelling of 19348861811 in words is "nineteen billion, three hundred forty-eight million, eight hundred sixty-one thousand, eight hundred eleven".