128222377778 has 16 divisors (see below), whose sum is σ = 210316832640. Its totient is φ = 58144455600.

The previous prime is 128222377757. The next prime is 128222377873. The reversal of 128222377778 is 877773222821.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6912698 + ... + 6931221.

It is an arithmetic number, because the mean of its divisors is an integer number (13144802040).

Almost surely, 2^128222377778 is an apocalyptic number.

128222377778 is a deficient number, since it is larger than the sum of its proper divisors (82094454862).

128222377778 is a wasteful number, since it uses less digits than its factorization.

128222377778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13844353.

The product of its digits is 7375872, while the sum is 56.

The spelling of 128222377778 in words is "one hundred twenty-eight billion, two hundred twenty-two million, three hundred seventy-seven thousand, seven hundred seventy-eight".