55009999 has 8 divisors (see below), whose sum is σ = 60099840. Its totient is φ = 49935000.

The previous prime is 55009957. The next prime is 55010003. The reversal of 55009999 is 99990055.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55009999 - 2¹⁵ = 54977231 is a prime.

It is a Duffinian number.

55009999 is a modest number, since divided by 9999 gives 5500 as remainder.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55009939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4932 + ... + 11590.

It is an arithmetic number, because the mean of its divisors is an integer number (7512480).

Almost surely, 2^55009999 is an apocalyptic number.

55009999 is a deficient number, since it is larger than the sum of its proper divisors (5089841).

55009999 is a wasteful number, since it uses less digits than its factorization.

55009999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7421.

The product of its (nonzero) digits is 164025, while the sum is 46.

The square root of 55009999 is about 7416.8725889016. The cubic root of 55009999 is about 380.3182905716.

The spelling of 55009999 in words is "fifty-five million, nine thousand, nine hundred ninety-nine".