1660105005581 has 32 divisors (see below), whose sum is σ = 1841207571840. Its totient is φ = 1484295321600.

The previous prime is 1660105005527. The next prime is 1660105005599. The reversal of 1660105005581 is 1855005010661.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1660105005581 is a prime.

It is a super-2 number, since 2×1660105005581² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660105008581) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 80887601 + ... + 80908121.

It is an arithmetic number, because the mean of its divisors is an integer number (57537736620).

Almost surely, 2^{1660105005581} is an apocalyptic number.

1660105005581 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1660105005581 is a deficient number, since it is larger than the sum of its proper divisors (181102566259).

1660105005581 is a wasteful number, since it uses less digits than its factorization.

1660105005581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21165.

The product of its (nonzero) digits is 36000, while the sum is 38.

The spelling of 1660105005581 in words is "one trillion, six hundred sixty billion, one hundred five million, five thousand, five hundred eighty-one".