55005559 has 8 divisors (see below), whose sum is σ = 64397088. Its totient is φ = 45997440.
The previous prime is 55005553. The next prime is 55005583. The reversal of 55005559 is 95550055.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-55005559 is a prime.
It is a super-2 number, since 2×550055592 = 6051223041804962, which contains 22 as substring.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (55005553) 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, 95542 + ... + 96115.
It is an arithmetic number, because the mean of its divisors is an integer number (8049636).
Almost surely, 255005559 is an apocalyptic number.
55005559 is a deficient number, since it is larger than the sum of its proper divisors (9391529).
55005559 is a wasteful number, since it uses less digits than its factorization.
55005559 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 191705.
The product of its (nonzero) digits is 28125, while the sum is 34.
The square root of 55005559 is about 7416.5732653295. The cubic root of 55005559 is about 380.3080581371.
The spelling of 55005559 in words is "fifty-five million, five thousand, five hundred fifty-nine".
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