1605464505 has 24 divisors (see below), whose sum is σ = 2878766280. Its totient is φ = 826721280.

The previous prime is 1605464501. The next prime is 1605464533. The reversal of 1605464505 is 5054645061.

1605464505 is a `hidden beast` number, since 1 + 6 + 0 + 5 + 4 + 645 + 0 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 572549184 + 1032915321 = 23928^2 + 32139^2 .

It is not a de Polignac number, because 1605464505 - 2² = 1605464501 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1605464505.

It is not an unprimeable number, because it can be changed into a prime (1605464501) 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, 613816 + ... + 616425.

It is an arithmetic number, because the mean of its divisors is an integer number (119948595).

Almost surely, 2^1605464505 is an apocalyptic number.

1605464505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1605464505 is a deficient number, since it is larger than the sum of its proper divisors (1273301775).

1605464505 is a wasteful number, since it uses less digits than its factorization.

1605464505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1230281 (or 1230278 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The square root of 1605464505 is about 40068.2480899777. The cubic root of 1605464505 is about 1170.9371080904.

It can be divided in two parts, 1 and 605464505, that added together give a palindrome (605464506).

The spelling of 1605464505 in words is "one billion, six hundred five million, four hundred sixty-four thousand, five hundred five".