55666161065651 has 16 divisors (see below), whose sum is σ = 58546935226368. Its totient is φ = 52853236581600.

The previous prime is 55666161065629. The next prime is 55666161065699. The reversal of 55666161065651 is 15656016166655.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55666161065651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55666161365651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123840230 + ... + 124288916.

It is an arithmetic number, because the mean of its divisors is an integer number (3659183451648).

Almost surely, 2^{55666161065651} is an apocalyptic number.

55666161065651 is a deficient number, since it is larger than the sum of its proper divisors (2880774160717).

55666161065651 is a wasteful number, since it uses less digits than its factorization.

55666161065651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524282.

The product of its (nonzero) digits is 29160000, while the sum is 59.

The spelling of 55666161065651 in words is "fifty-five trillion, six hundred sixty-six billion, one hundred sixty-one million, sixty-five thousand, six hundred fifty-one".