55521550 has 24 divisors (see below), whose sum is σ = 118023696. Its totient is φ = 19035840.

The previous prime is 55521547. The next prime is 55521577. The reversal of 55521550 is 5512555.

It is a happy number.

55521550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78967 + ... + 79666.

It is an arithmetic number, because the mean of its divisors is an integer number (4917654).

Almost surely, 2^55521550 is an apocalyptic number.

55521550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

55521550 is an abundant number, since it is smaller than the sum of its proper divisors (62502146).

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

55521550 is a wasteful number, since it uses less digits than its factorization.

55521550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158652 (or 158647 counting only the distinct ones).

The product of its (nonzero) digits is 6250, while the sum is 28.

The square root of 55521550 is about 7451.2784138026. The cubic root of 55521550 is about 381.4935450068.

The spelling of 55521550 in words is "fifty-five million, five hundred twenty-one thousand, five hundred fifty".