1605255503 has 4 divisors (see below), whose sum is σ = 1605338040. Its totient is φ = 1605172968.

The previous prime is 1605255497. The next prime is 1605255517. The reversal of 1605255503 is 3055525061.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1605255503 - 2¹² = 1605251407 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1605255503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1605255563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5801 + ... + 56957.

It is an arithmetic number, because the mean of its divisors is an integer number (401334510).

Almost surely, 2^1605255503 is an apocalyptic number.

1605255503 is a deficient number, since it is larger than the sum of its proper divisors (82537).

1605255503 is an equidigital number, since it uses as much as digits as its factorization.

1605255503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82536.

The product of its (nonzero) digits is 22500, while the sum is 32.

The square root of 1605255503 is about 40065.6399299949. The cubic root of 1605255503 is about 1170.8862943815.

The spelling of 1605255503 in words is "one billion, six hundred five million, two hundred fifty-five thousand, five hundred three".