55800066 has 16 divisors (see below), whose sum is σ = 127543104. Its totient is φ = 15942864.

The previous prime is 55800049. The next prime is 55800071. The reversal of 55800066 is 66000855.

It is a super-2 number, since 2×55800066² = 6227294731208712, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 664245 + ... + 664328.

It is an arithmetic number, because the mean of its divisors is an integer number (7971444).

Almost surely, 2^55800066 is an apocalyptic number.

55800066 is an abundant number, since it is smaller than the sum of its proper divisors (71743038).

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

55800066 is a wasteful number, since it uses less digits than its factorization.

55800066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328585.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 55800066 is about 7469.9441764982. The cubic root of 55800066 is about 382.1303841172.

The spelling of 55800066 in words is "fifty-five million, eight hundred thousand, sixty-six".