555116661 has 72 divisors (see below), whose sum is σ = 946108800. Its totient is φ = 312586560.

The previous prime is 555116629. The next prime is 555116677. The reversal of 555116661 is 166611555.

It is not a de Polignac number, because 555116661 - 2⁵ = 555116629 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (555116621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 926440 + ... + 927038.

It is an arithmetic number, because the mean of its divisors is an integer number (13140400).

Almost surely, 2^555116661 is an apocalyptic number.

It is an amenable number.

555116661 is a deficient number, since it is larger than the sum of its proper divisors (390992139).

555116661 is a wasteful number, since it uses less digits than its factorization.

555116661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687 (or 673 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The square root of 555116661 is about 23560.9138405114. The cubic root of 555116661 is about 821.8541530005.

The spelling of 555116661 in words is "five hundred fifty-five million, one hundred sixteen thousand, six hundred sixty-one".