1181181660 has 24 divisors (see below), whose sum is σ = 3307308816. Its totient is φ = 314981760.

The previous prime is 1181181637. The next prime is 1181181671. The reversal of 1181181660 is 661811811.

It is a super-2 number, since 2×1181181660² = 2790380227840711200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9843121 + ... + 9843240.

It is an arithmetic number, because the mean of its divisors is an integer number (137804534).

Almost surely, 2^1181181660 is an apocalyptic number.

1181181660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1181181660 is an abundant number, since it is smaller than the sum of its proper divisors (2126127156).

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

1181181660 is a wasteful number, since it uses less digits than its factorization.

1181181660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19686373 (or 19686371 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 33.

The square root of 1181181660 is about 34368.3234970809. The cubic root of 1181181660 is about 1057.0744237067.

The spelling of 1181181660 in words is "one billion, one hundred eighty-one million, one hundred eighty-one thousand, six hundred sixty".