55605559 has 8 divisors (see below), whose sum is σ = 59258880. Its totient is φ = 52055256.

The previous prime is 55605527. The next prime is 55605577. The reversal of 55605559 is 95550655.

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

It is not a de Polignac number, because 55605559 - 2⁵ = 55605527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55605659) 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, 24639 + ... + 26800.

It is an arithmetic number, because the mean of its divisors is an integer number (7407360).

Almost surely, 2^55605559 is an apocalyptic number.

55605559 is a deficient number, since it is larger than the sum of its proper divisors (3653321).

55605559 is a wasteful number, since it uses less digits than its factorization.

55605559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51509.

The product of its (nonzero) digits is 168750, while the sum is 40.

The square root of 55605559 is about 7456.9135035885. The cubic root of 55605559 is about 381.6858591655.

The spelling of 55605559 in words is "fifty-five million, six hundred five thousand, five hundred fifty-nine".