55061550 has 72 divisors (see below), whose sum is σ = 151976136. Its totient is φ = 14281920.

The previous prime is 55061507. The next prime is 55061551. The reversal of 55061550 is 5516055.

55061550 is a `hidden beast` number, since 5 + 50 + 61 + 550 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55061551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 14997 + ... + 18303.

Almost surely, 2^55061550 is an apocalyptic number.

55061550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 55061550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75988068).

55061550 is an abundant number, since it is smaller than the sum of its proper divisors (96914586).

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

55061550 is a wasteful number, since it uses less digits than its factorization.

55061550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3362 (or 3354 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 55061550 is about 7420.3470269254. The cubic root of 55061550 is about 380.4370548412.

It can be divided in two parts, 55061 and 550, that added together give a triangular number (55611 = T₃₃₃).

The spelling of 55061550 in words is "fifty-five million, sixty-one thousand, five hundred fifty".