1218031660 has 12 divisors (see below), whose sum is σ = 2557866528. Its totient is φ = 487212656.

The previous prime is 1218031627. The next prime is 1218031667. The reversal of 1218031660 is 661308121.

1218031660 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1218031660² = 2967202249524711200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1218031667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30450772 + ... + 30450811.

It is an arithmetic number, because the mean of its divisors is an integer number (213155544).

Almost surely, 2^1218031660 is an apocalyptic number.

1218031660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1218031660 is an abundant number, since it is smaller than the sum of its proper divisors (1339834868).

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

1218031660 is a wasteful number, since it uses less digits than its factorization.

1218031660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60901592 (or 60901590 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1218031660 is about 34900.3103138067. The cubic root of 1218031660 is about 1067.9547678712.

Adding to 1218031660 its reverse (661308121), we get a palindrome (1879339781).

The spelling of 1218031660 in words is "one billion, two hundred eighteen million, thirty-one thousand, six hundred sixty".