1218732668 has 24 divisors (see below), whose sum is σ = 2194159968. Its totient is φ = 592053696.

The previous prime is 1218732643. The next prime is 1218732673. The reversal of 1218732668 is 8662378121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6071 + ... + 49742.

It is an arithmetic number, because the mean of its divisors is an integer number (91423332).

Almost surely, 2^1218732668 is an apocalyptic number.

It is an amenable number.

1218732668 is a deficient number, since it is larger than the sum of its proper divisors (975427300).

1218732668 is a wasteful number, since it uses less digits than its factorization.

1218732668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55973 (or 55971 counting only the distinct ones).

The product of its digits is 193536, while the sum is 44.

The square root of 1218732668 is about 34910.3518744799. The cubic root of 1218732668 is about 1068.1596068982.

The spelling of 1218732668 in words is "one billion, two hundred eighteen million, seven hundred thirty-two thousand, six hundred sixty-eight".