55500066 has 20 divisors (see below), whose sum is σ = 124361622. Its totient is φ = 18499968.

The previous prime is 55500047. The next prime is 55500077. The reversal of 55500066 is 66000555.

It can be written as a sum of positive squares in only one way, i.e., 32661225 + 22838841 = 5715^2 + 4779^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 171135 + ... + 171458.

Almost surely, 2^55500066 is an apocalyptic number.

55500066 is an abundant number, since it is smaller than the sum of its proper divisors (68861556).

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

55500066 is a wasteful number, since it uses less digits than its factorization.

55500066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342607 (or 342598 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 55500066 is about 7449.8366425043. The cubic root of 55500066 is about 381.4443324957. Note that the first 3 decimals are identical.

The spelling of 55500066 in words is "fifty-five million, five hundred thousand, sixty-six".