1331170566 has 128 divisors (see below), whose sum is σ = 3114270720. Its totient is φ = 375580800.

The previous prime is 1331170543. The next prime is 1331170573. The reversal of 1331170566 is 6650711331.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

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 63 ways as a sum of consecutive naturals, for example, 10481595 + ... + 10481721.

It is an arithmetic number, because the mean of its divisors is an integer number (24330240).

Almost surely, 2^1331170566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1331170566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1557135360).

1331170566 is an abundant number, since it is smaller than the sum of its proper divisors (1783100154).

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

1331170566 is a wasteful number, since it uses less digits than its factorization.

1331170566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330.

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 1331170566 is about 36485.2102364780. The cubic root of 1331170566 is about 1100.0469858718.

Adding to 1331170566 its reverse (6650711331), we get a palindrome (7981881897).

The spelling of 1331170566 in words is "one billion, three hundred thirty-one million, one hundred seventy thousand, five hundred sixty-six".