1605664103 has 6 divisors (see below), whose sum is σ = 1694620944. Its totient is φ = 1521155124.

The previous prime is 1605664051. The next prime is 1605664117. The reversal of 1605664103 is 3014665061.

It is not a de Polignac number, because 1605664103 - 2²⁰ = 1604615527 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1605664103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605664153) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2223551 + ... + 2224272.

It is an arithmetic number, because the mean of its divisors is an integer number (282436824).

Almost surely, 2^1605664103 is an apocalyptic number.

1605664103 is a deficient number, since it is larger than the sum of its proper divisors (88956841).

1605664103 is an equidigital number, since it uses as much as digits as its factorization.

1605664103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4447861 (or 4447842 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 1605664103 is about 40070.7387378870. The cubic root of 1605664103 is about 1170.9856313307.

The spelling of 1605664103 in words is "one billion, six hundred five million, six hundred sixty-four thousand, one hundred three".