1118815778 has 4 divisors (see below), whose sum is σ = 1678223670. Its totient is φ = 559407888.

The previous prime is 1118815697. The next prime is 1118815787. The reversal of 1118815778 is 8775188111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8775188111 = 53 ⋅165569587.

It can be written as a sum of positive squares in only one way, i.e., 1105762009 + 13053769 = 33253^2 + 3613^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 279703943 + ... + 279703946.

Almost surely, 2^1118815778 is an apocalyptic number.

1118815778 is a deficient number, since it is larger than the sum of its proper divisors (559407892).

1118815778 is an equidigital number, since it uses as much as digits as its factorization.

1118815778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559407891.

The product of its digits is 125440, while the sum is 47.

The square root of 1118815778 is about 33448.7036819067. The cubic root of 1118815778 is about 1038.1326754747.

The spelling of 1118815778 in words is "one billion, one hundred eighteen million, eight hundred fifteen thousand, seven hundred seventy-eight".