1228340111779 has 4 divisors (see below), whose sum is σ = 1340007394680. Its totient is φ = 1116672828880.

The previous prime is 1228340111771. The next prime is 1228340111783. The reversal of 1228340111779 is 9771110438221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1228340111779 - 2³ = 1228340111771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1228340111771) 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, 55833641434 + ... + 55833641455.

It is an arithmetic number, because the mean of its divisors is an integer number (335001848670).

Almost surely, 2^{1228340111779} is an apocalyptic number.

1228340111779 is a deficient number, since it is larger than the sum of its proper divisors (111667282901).

1228340111779 is a wasteful number, since it uses less digits than its factorization.

1228340111779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111667282900.

The product of its (nonzero) digits is 169344, while the sum is 46.

The spelling of 1228340111779 in words is "one trillion, two hundred twenty-eight billion, three hundred forty million, one hundred eleven thousand, seven hundred seventy-nine".