16504644465 has 24 divisors (see below), whose sum is σ = 28630517760. Its totient is φ = 8795564064.

The previous prime is 16504644449. The next prime is 16504644469. The reversal of 16504644465 is 56444640561.

16504644465 is a `hidden beast` number, since 165 + 0 + 46 + 4 + 446 + 5 = 666.

It is not a de Polignac number, because 16504644465 - 2⁴ = 16504644449 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 16504644465.

It is not an unprimeable number, because it can be changed into a prime (16504644469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85827 + ... + 200936.

It is an arithmetic number, because the mean of its divisors is an integer number (1192938240).

Almost surely, 2^16504644465 is an apocalyptic number.

16504644465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16504644465 is a deficient number, since it is larger than the sum of its proper divisors (12125873295).

16504644465 is a wasteful number, since it uses less digits than its factorization.

16504644465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288053 (or 288050 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 45.

It can be divided in two parts, 16504 and 644465, that added together give a square (660969 = 813²).

The spelling of 16504644465 in words is "sixteen billion, five hundred four million, six hundred forty-four thousand, four hundred sixty-five".