16550111 has 4 divisors (see below), whose sum is σ = 16559952. Its totient is φ = 16540272.

The previous prime is 16550099. The next prime is 16550113. The reversal of 16550111 is 11105561.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 11105561 = 389 ⋅28549.

It is a cyclic number.

It is not a de Polignac number, because 16550111 - 2⁶ = 16550047 is a prime.

It is a super-2 number, since 2×16550111² = 547812348224642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16550113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1691 + ... + 5996.

It is an arithmetic number, because the mean of its divisors is an integer number (4139988).

Almost surely, 2^16550111 is an apocalyptic number.

16550111 is a deficient number, since it is larger than the sum of its proper divisors (9841).

16550111 is an equidigital number, since it uses as much as digits as its factorization.

16550111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9840.

The product of its (nonzero) digits is 150, while the sum is 20.

The square root of 16550111 is about 4068.1827638394. The cubic root of 16550111 is about 254.8396326033.

Adding to 16550111 its reverse (11105561), we get a palindrome (27655672).

It can be divided in two parts, 16550 and 111, that added together give a palindrome (16661).

The spelling of 16550111 in words is "sixteen million, five hundred fifty thousand, one hundred eleven".