1118666778 has 48 divisors (see below), whose sum is σ = 2360292480. Its totient is φ = 353406592.

The previous prime is 1118666777. The next prime is 1118666803. The reversal of 1118666778 is 8776668111.

It is a self number, because there is not a number n which added to its sum of digits gives 1118666778.

It is not an unprimeable number, because it can be changed into a prime (1118666777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 357103 + ... + 360221.

It is an arithmetic number, because the mean of its divisors is an integer number (49172760).

Almost surely, 2^1118666778 is an apocalyptic number.

1118666778 is an abundant number, since it is smaller than the sum of its proper divisors (1241625702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1118666778 is a wasteful number, since it uses less digits than its factorization.

1118666778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3283 (or 3260 counting only the distinct ones).

The product of its digits is 677376, while the sum is 51.

The square root of 1118666778 is about 33446.4763166466. The cubic root of 1118666778 is about 1038.0865884606.

The spelling of 1118666778 in words is "one billion, one hundred eighteen million, six hundred sixty-six thousand, seven hundred seventy-eight".