55566166111616 has 64 divisors (see below), whose sum is σ = 114559824366000. Its totient is φ = 26814639753216.

The previous prime is 55566166111579. The next prime is 55566166111661. The reversal of 55566166111616 is 61611166166555.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 6671090 + ... + 12475406.

Almost surely, 2^{55566166111616} 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 55566166111616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57279912183000).

55566166111616 is an abundant number, since it is smaller than the sum of its proper divisors (58993658254384).

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

55566166111616 is a wasteful number, since it uses less digits than its factorization.

55566166111616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5806939 (or 5806927 counting only the distinct ones).

The product of its digits is 5832000, while the sum is 56.

The spelling of 55566166111616 in words is "fifty-five trillion, five hundred sixty-six billion, one hundred sixty-six million, one hundred eleven thousand, six hundred sixteen".