118121866 has 4 divisors (see below), whose sum is σ = 177182802. Its totient is φ = 59060932.

The previous prime is 118121863. The next prime is 118121881. The reversal of 118121866 is 668121811.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 104468841 + 13653025 = 10221^2 + 3695^2 .

It is not an unprimeable number, because it can be changed into a prime (118121863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 29530465 + ... + 29530468.

Almost surely, 2^118121866 is an apocalyptic number.

118121866 is a deficient number, since it is larger than the sum of its proper divisors (59060936).

118121866 is an equidigital number, since it uses as much as digits as its factorization.

118121866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59060935.

The product of its digits is 4608, while the sum is 34.

The square root of 118121866 is about 10868.3883809882. The cubic root of 118121866 is about 490.6556072214.

Subtracting 118121866 from its reverse (668121811), we obtain a palindrome (549999945).

The spelling of 118121866 in words is "one hundred eighteen million, one hundred twenty-one thousand, eight hundred sixty-six".