1605320563 has 16 divisors (see below), whose sum is σ = 2021264640. Its totient is φ = 1238508000.

The previous prime is 1605320503. The next prime is 1605320597. The reversal of 1605320563 is 3650235061.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1605320563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1605320503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95433 + ... + 110986.

It is an arithmetic number, because the mean of its divisors is an integer number (126329040).

Almost surely, 2^1605320563 is an apocalyptic number.

1605320563 is a deficient number, since it is larger than the sum of its proper divisors (415944077).

1605320563 is a wasteful number, since it uses less digits than its factorization.

1605320563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206538.

The product of its (nonzero) digits is 16200, while the sum is 31.

The square root of 1605320563 is about 40066.4518394130. The cubic root of 1605320563 is about 1170.9021125972.

The spelling of 1605320563 in words is "one billion, six hundred five million, three hundred twenty thousand, five hundred sixty-three".