1331718660 has 72 divisors (see below), whose sum is σ = 4042538136. Its totient is φ = 354862080.

The previous prime is 1331718631. The next prime is 1331718697. The reversal of 1331718660 is 668171331.

It can be written as a sum of positive squares in 4 ways, for example, as 839145024 + 492573636 = 28968^2 + 22194^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 433530 + ... + 436590.

It is an arithmetic number, because the mean of its divisors is an integer number (56146363).

Almost surely, 2^1331718660 is an apocalyptic number.

1331718660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331718660 is an abundant number, since it is smaller than the sum of its proper divisors (2710819476).

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

1331718660 is a wasteful number, since it uses less digits than its factorization.

1331718660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5493 (or 5488 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 1331718660 is about 36492.7206439860. The cubic root of 1331718660 is about 1100.1979423401.

Adding to 1331718660 its reverse (668171331), we get a palindrome (1999889991).

The spelling of 1331718660 in words is "one billion, three hundred thirty-one million, seven hundred eighteen thousand, six hundred sixty".