1666650165560 has 16 divisors (see below), whose sum is σ = 3749962872600. Its totient is φ = 666660066208.

The previous prime is 1666650165511. The next prime is 1666650165619. The reversal of 1666650165560 is 655610566661.

It is a happy number.

It is a super-2 number, since 2×1666650165560² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20833127030 + ... + 20833127109.

Almost surely, 2^{1666650165560} is an apocalyptic number.

1666650165560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666650165560 is an abundant number, since it is smaller than the sum of its proper divisors (2083312707040).

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

1666650165560 is a wasteful number, since it uses less digits than its factorization.

1666650165560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41666254150 (or 41666254146 counting only the distinct ones).

The product of its (nonzero) digits is 5832000, while the sum is 53.

The spelling of 1666650165560 in words is "one trillion, six hundred sixty-six billion, six hundred fifty million, one hundred sixty-five thousand, five hundred sixty".