16550556 has 24 divisors (see below), whose sum is σ = 42129024. Its totient is φ = 5015280.

The previous prime is 16550549. The next prime is 16550557. The reversal of 16550556 is 65505561.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16550557) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 62560 + ... + 62823.

It is an arithmetic number, because the mean of its divisors is an integer number (1755376).

Almost surely, 2^16550556 is an apocalyptic number.

It is an amenable number.

16550556 is an abundant number, since it is smaller than the sum of its proper divisors (25578468).

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

16550556 is a wasteful number, since it uses less digits than its factorization.

16550556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125401 (or 125399 counting only the distinct ones).

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

The square root of 16550556 is about 4068.2374561965. The cubic root of 16550556 is about 254.8419166286.

It can be divided in two parts, 165505 and 56, that added together give a palindrome (165561).

The spelling of 16550556 in words is "sixteen million, five hundred fifty thousand, five hundred fifty-six".