55500809 has 16 divisors (see below), whose sum is σ = 70667520. Its totient is φ = 42396480.

The previous prime is 55500803. The next prime is 55500821. The reversal of 55500809 is 90800555.

It is not a de Polignac number, because 55500809 - 2¹² = 55496713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55500803) 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 15 ways as a sum of consecutive naturals, for example, 7877 + ... + 13154.

It is an arithmetic number, because the mean of its divisors is an integer number (4416720).

Almost surely, 2^55500809 is an apocalyptic number.

It is an amenable number.

55500809 is a deficient number, since it is larger than the sum of its proper divisors (15166711).

55500809 is a wasteful number, since it uses less digits than its factorization.

55500809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21080.

The product of its (nonzero) digits is 9000, while the sum is 32.

The square root of 55500809 is about 7449.8865092027. The cubic root of 55500809 is about 381.4460346671.

The spelling of 55500809 in words is "fifty-five million, five hundred thousand, eight hundred nine".