1123666778 has 16 divisors (see below), whose sum is σ = 1816214400. Its totient is φ = 518312496.

The previous prime is 1123666777. The next prime is 1123666793. The reversal of 1123666778 is 8776663211.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1123666777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36323 + ... + 59721.

It is an arithmetic number, because the mean of its divisors is an integer number (113513400).

Almost surely, 2^1123666778 is an apocalyptic number.

1123666778 is a deficient number, since it is larger than the sum of its proper divisors (692547622).

1123666778 is a wasteful number, since it uses less digits than its factorization.

1123666778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25261.

The product of its digits is 508032, while the sum is 47.

The square root of 1123666778 is about 33521.1392706155. The cubic root of 1123666778 is about 1039.6309026762.

The spelling of 1123666778 in words is "one billion, one hundred twenty-three million, six hundred sixty-six thousand, seven hundred seventy-eight".