55666066501656 has 128 divisors (see below), whose sum is σ = 166546848888000. Its totient is φ = 17125507897344.

The previous prime is 55666066501613. The next prime is 55666066501697. The reversal of 55666066501656 is 65610566066655.

It is a junction number, because it is equal to n+sod(n) for n = 55666066501593 and 55666066501602.

It is a congruent number.

It is an unprimeable number.

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, 17736450 + ... + 20637678.

Almost surely, 2^{55666066501656} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55666066501656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83273424444000).

55666066501656 is an abundant number, since it is smaller than the sum of its proper divisors (110880782386344).

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

55666066501656 is a wasteful number, since it uses less digits than its factorization.

55666066501656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2908090 (or 2908080 counting only the distinct ones).

The product of its (nonzero) digits is 174960000, while the sum is 63.

The spelling of 55666066501656 in words is "fifty-five trillion, six hundred sixty-six billion, sixty-six million, five hundred one thousand, six hundred fifty-six".