55505566 has 4 divisors (see below), whose sum is σ = 83258352. Its totient is φ = 27752782.

The previous prime is 55505557. The next prime is 55505581. The reversal of 55505566 is 66550555.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13876390 + ... + 13876393.

It is an arithmetic number, because the mean of its divisors is an integer number (20814588).

Almost surely, 2^55505566 is an apocalyptic number.

55505566 is a deficient number, since it is larger than the sum of its proper divisors (27752786).

55505566 is a wasteful number, since it uses less digits than its factorization.

55505566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27752785.

The product of its (nonzero) digits is 112500, while the sum is 37.

The square root of 55505566 is about 7450.2057689704. The cubic root of 55505566 is about 381.4569323277.

The spelling of 55505566 in words is "fifty-five million, five hundred five thousand, five hundred sixty-six".