55666688 has 96 divisors (see below), whose sum is σ = 139164480. Its totient is φ = 21626880.

The previous prime is 55666679. The next prime is 55666697. The reversal of 55666688 is 88666655.

It is an interprime number because it is at equal distance from previous prime (55666679) and next prime (55666697).

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157520 + ... + 157872.

It is an arithmetic number, because the mean of its divisors is an integer number (1449630).

Almost surely, 2^55666688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55666688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69582240).

55666688 is an abundant number, since it is smaller than the sum of its proper divisors (83497792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55666688 is a wasteful number, since it uses less digits than its factorization.

55666688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393 (or 373 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 50.

The square root of 55666688 is about 7461.0111915209. The cubic root of 55666688 is about 381.8256745042.

The spelling of 55666688 in words is "fifty-five million, six hundred sixty-six thousand, six hundred eighty-eight".