55065166565661 has 28 divisors (see below), whose sum is σ = 94354265431072. Its totient is φ = 31465809463176.

The previous prime is 55065166565621. The next prime is 55065166565723. The reversal of 55065166565661 is 16656566156055.

55065166565661 is a `hidden beast` number, since 5 + 5 + 0 + 6 + 5 + 1 + 6 + 6 + 565 + 6 + 61 = 666.

It is not a de Polignac number, because 55065166565661 - 2¹⁰ = 55065166564637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55065166565621) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 5395366891 + ... + 5395377096.

Almost surely, 2^{55065166565661} is an apocalyptic number.

It is an amenable number.

55065166565661 is a deficient number, since it is larger than the sum of its proper divisors (39289098865411).

55065166565661 is an equidigital number, since it uses as much as digits as its factorization.

55065166565661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10790744012 (or 10790743997 counting only the distinct ones).

The product of its (nonzero) digits is 145800000, while the sum is 63.

The spelling of 55065166565661 in words is "fifty-five trillion, sixty-five billion, one hundred sixty-six million, five hundred sixty-five thousand, six hundred sixty-one".