16671505 has 4 divisors (see below), whose sum is σ = 20005812. Its totient is φ = 13337200.

The previous prime is 16671503. The next prime is 16671539. The reversal of 16671505 is 50517661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50517661 = 131 ⋅385631.

It can be written as a sum of positive squares in 2 ways, for example, as 13300609 + 3370896 = 3647^2 + 1836^2 .

It is not a de Polignac number, because 16671505 - 2¹ = 16671503 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (16671503) 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 3 ways as a sum of consecutive naturals, for example, 1667146 + ... + 1667155.

It is an arithmetic number, because the mean of its divisors is an integer number (5001453).

Almost surely, 2^16671505 is an apocalyptic number.

It is an amenable number.

16671505 is a deficient number, since it is larger than the sum of its proper divisors (3334307).

16671505 is an equidigital number, since it uses as much as digits as its factorization.

16671505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3334306.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 16671505 is about 4083.0754340325. The cubic root of 16671505 is about 255.4611928095.

The spelling of 16671505 in words is "sixteen million, six hundred seventy-one thousand, five hundred five".