222688688978 has 54 divisors (see below), whose sum is σ = 394569057519. Its totient is φ = 93986488512.

The previous prime is 222688688977. The next prime is 222688688993. The reversal of 222688688978 is 879886886222.

It can be written as a sum of positive squares in 5 ways, for example, as 65097950449 + 157590738529 = 255143^2 + 396977^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=333683.

It is not an unprimeable number, because it can be changed into a prime (222688688977) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 341023700 + ... + 341024352.

Almost surely, 2^222688688978 is an apocalyptic number.

222688688978 is a deficient number, since it is larger than the sum of its proper divisors (171880368541).

222688688978 is an frugal number, since it uses more digits than its factorization.

222688688978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1468 (or 735 counting only the distinct ones).

The product of its digits is 594542592, while the sum is 74.

The spelling of 222688688978 in words is "two hundred twenty-two billion, six hundred eighty-eight million, six hundred eighty-eight thousand, nine hundred seventy-eight".