55616550 has 96 divisors (see below), whose sum is σ = 154704384. Its totient is φ = 13104000.

The previous prime is 55616549. The next prime is 55616563. The reversal of 55616550 is 5561655.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 60595 + ... + 61505.

It is an arithmetic number, because the mean of its divisors is an integer number (1611504).

Almost surely, 2^55616550 is an apocalyptic number.

55616550 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 55616550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77352192).

55616550 is an abundant number, since it is smaller than the sum of its proper divisors (99087834).

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

55616550 is a wasteful number, since it uses less digits than its factorization.

55616550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974 (or 969 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 33.

The square root of 55616550 is about 7457.6504342856. The cubic root of 55616550 is about 381.7110055297.

It can be divided in two parts, 55 and 616550, that added together give a triangular number (616605 = T₁₁₁₀).

The spelling of 55616550 in words is "fifty-five million, six hundred sixteen thousand, five hundred fifty".