1228395616779 has 32 divisors (see below), whose sum is σ = 1665276480000. Its totient is φ = 805267862784.

The previous prime is 1228395616759. The next prime is 1228395616793. The reversal of 1228395616779 is 9776165938221.

It is a happy number.

It is not a de Polignac number, because 1228395616779 - 2⁸ = 1228395616523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1228395616759) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 362463817 + ... + 362467205.

It is an arithmetic number, because the mean of its divisors is an integer number (52039890000).

Almost surely, 2^{1228395616779} is an apocalyptic number.

1228395616779 is a deficient number, since it is larger than the sum of its proper divisors (436880863221).

1228395616779 is a wasteful number, since it uses less digits than its factorization.

1228395616779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6147.

The product of its digits is 68584320, while the sum is 66.

The spelling of 1228395616779 in words is "one trillion, two hundred twenty-eight billion, three hundred ninety-five million, six hundred sixteen thousand, seven hundred seventy-nine".