16551005 has 4 divisors (see below), whose sum is σ = 19861212. Its totient is φ = 13240800.

The previous prime is 16550987. The next prime is 16551011. The reversal of 16551005 is 50015561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50015561 = 977 ⋅51193.

It can be written as a sum of positive squares in 2 ways, for example, as 9966649 + 6584356 = 3157^2 + 2566^2 .

It is not a de Polignac number, because 16551005 - 2⁸ = 16550749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1655096 + ... + 1655105.

It is an arithmetic number, because the mean of its divisors is an integer number (4965303).

Almost surely, 2^16551005 is an apocalyptic number.

It is an amenable number.

16551005 is a deficient number, since it is larger than the sum of its proper divisors (3310207).

16551005 is an equidigital number, since it uses as much as digits as its factorization.

16551005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3310206.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 16551005 is about 4068.2926394250. The cubic root of 16551005 is about 254.8442211431.

Adding to 16551005 its reverse (50015561), we get a palindrome (66566566).

The spelling of 16551005 in words is "sixteen million, five hundred fifty-one thousand, five".