1218661080 has 128 divisors (see below), whose sum is σ = 4499712000. Its totient is φ = 257121792.

The previous prime is 1218661063. The next prime is 1218661091. The reversal of 1218661080 is 801668121.

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 31 ways as a sum of consecutive naturals, for example, 44880 + ... + 66719.

It is an arithmetic number, because the mean of its divisors is an integer number (35154000).

Almost surely, 2^1218661080 is an apocalyptic number.

1218661080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1218661080 is an abundant number, since it is smaller than the sum of its proper divisors (3281050920).

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

1218661080 is a wasteful number, since it uses less digits than its factorization.

1218661080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111633 (or 111629 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 1218661080 is about 34909.3265475002. The cubic root of 1218661080 is about 1068.1386920279.

The spelling of 1218661080 in words is "one billion, two hundred eighteen million, six hundred sixty-one thousand, eighty".