16505265 has 32 divisors (see below), whose sum is σ = 30375936. Its totient is φ = 7496640.

The previous prime is 16505261. The next prime is 16505267. The reversal of 16505265 is 56250561.

It is not a de Polignac number, because 16505265 - 2² = 16505261 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16505261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19644 + ... + 20466.

It is an arithmetic number, because the mean of its divisors is an integer number (949248).

Almost surely, 2^16505265 is an apocalyptic number.

16505265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16505265 is a deficient number, since it is larger than the sum of its proper divisors (13870671).

16505265 is a wasteful number, since it uses less digits than its factorization.

16505265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 16505265 is about 4062.6672273274. The cubic root of 16505265 is about 254.6092438885.

The spelling of 16505265 in words is "sixteen million, five hundred five thousand, two hundred sixty-five".