1181218660 has 12 divisors (see below), whose sum is σ = 2480559228. Its totient is φ = 472487456.

The previous prime is 1181218639. The next prime is 1181218663. The reversal of 1181218660 is 668121811.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 453945636 + 727273024 = 21306^2 + 26968^2 .

It is not an unprimeable number, because it can be changed into a prime (1181218663) 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, 29530447 + ... + 29530486.

It is an arithmetic number, because the mean of its divisors is an integer number (206713269).

Almost surely, 2^1181218660 is an apocalyptic number.

1181218660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1181218660 is an abundant number, since it is smaller than the sum of its proper divisors (1299340568).

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

1181218660 is a wasteful number, since it uses less digits than its factorization.

1181218660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59060942 (or 59060940 counting only the distinct ones).

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

The square root of 1181218660 is about 34368.8617792327. The cubic root of 1181218660 is about 1057.0854610565.

The spelling of 1181218660 in words is "one billion, one hundred eighty-one million, two hundred eighteen thousand, six hundred sixty".