165516447 has 4 divisors (see below), whose sum is σ = 220688600. Its totient is φ = 110344296.

The previous prime is 165516419. The next prime is 165516473. The reversal of 165516447 is 744615561.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 165516447 - 2⁷ = 165516319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165516647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27586072 + ... + 27586077.

It is an arithmetic number, because the mean of its divisors is an integer number (55172150).

Almost surely, 2^165516447 is an apocalyptic number.

165516447 is a deficient number, since it is larger than the sum of its proper divisors (55172153).

165516447 is an equidigital number, since it uses as much as digits as its factorization.

165516447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55172152.

The product of its digits is 100800, while the sum is 39.

The square root of 165516447 is about 12865.3195451959. The cubic root of 165516447 is about 549.0523040668.

The spelling of 165516447 in words is "one hundred sixty-five million, five hundred sixteen thousand, four hundred forty-seven".