55086661 has 4 divisors (see below), whose sum is σ = 62956192. Its totient is φ = 47217132.

The previous prime is 55086653. The next prime is 55086697. The reversal of 55086661 is 16668055.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16668055 = 5 ⋅3333611.

It is a cyclic number.

It is not a de Polignac number, because 55086661 - 2³ = 55086653 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55086661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55086611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3934755 + ... + 3934768.

It is an arithmetic number, because the mean of its divisors is an integer number (15739048).

Almost surely, 2^55086661 is an apocalyptic number.

It is an amenable number.

55086661 is a deficient number, since it is larger than the sum of its proper divisors (7869531).

55086661 is an equidigital number, since it uses as much as digits as its factorization.

55086661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7869530.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 55086661 is about 7422.0388708225. The cubic root of 55086661 is about 380.4948792396.

The spelling of 55086661 in words is "fifty-five million, eighty-six thousand, six hundred sixty-one".