1660165216056 has 48 divisors (see below), whose sum is σ = 4496929374600. Its totient is φ = 553308580032.

The previous prime is 1660165216051. The next prime is 1660165216063. The reversal of 1660165216056 is 6506125610661.

1660165216056 is a `hidden beast` number, since 1 + 6 + 6 + 0 + 16 + 5 + 21 + 605 + 6 = 666.

It is a super-2 number, since 2×1660165216056² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660165216051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1159371 + ... + 2159738.

Almost surely, 2^{1660165216056} is an apocalyptic number.

It is an amenable number.

1660165216056 is an abundant number, since it is smaller than the sum of its proper divisors (2836764158544).

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

1660165216056 is a wasteful number, since it uses less digits than its factorization.

1660165216056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3326068 (or 3326061 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The spelling of 1660165216056 in words is "one trillion, six hundred sixty billion, one hundred sixty-five million, two hundred sixteen thousand, fifty-six".