55505560 has 64 divisors (see below), whose sum is σ = 137700000. Its totient is φ = 19968000.

The previous prime is 55505557. The next prime is 55505581. The reversal of 55505560 is 6550555.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43816 + ... + 45064.

Almost surely, 2^55505560 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55505560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68850000).

55505560 is an abundant number, since it is smaller than the sum of its proper divisors (82194440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55505560 is a wasteful number, since it uses less digits than its factorization.

55505560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1372 (or 1368 counting only the distinct ones).

The product of its (nonzero) digits is 18750, while the sum is 31.

The square root of 55505560 is about 7450.2053662970. The cubic root of 55505560 is about 381.4569185829.

It can be divided in two parts, 55505 and 560, that added together give a palindrome (56065).

The spelling of 55505560 in words is "fifty-five million, five hundred five thousand, five hundred sixty".