55116661 has 16 divisors (see below), whose sum is σ = 57915648. Its totient is φ = 52416000.

The previous prime is 55116653. The next prime is 55116673. The reversal of 55116661 is 16661155.

It is a cyclic number.

It is not a de Polignac number, because 55116661 - 2³ = 55116653 is a prime.

It is a super-3 number, since 3×55116661³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55116161) 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, 364936 + ... + 365086.

It is an arithmetic number, because the mean of its divisors is an integer number (3619728).

Almost surely, 2^55116661 is an apocalyptic number.

It is an amenable number.

55116661 is a deficient number, since it is larger than the sum of its proper divisors (2798987).

55116661 is a wasteful number, since it uses less digits than its factorization.

55116661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372.

The product of its digits is 5400, while the sum is 31.

The square root of 55116661 is about 7424.0596037478. The cubic root of 55116661 is about 380.5639387580.

The spelling of 55116661 in words is "fifty-five million, one hundred sixteen thousand, six hundred sixty-one".