1606550565 has 16 divisors (see below), whose sum is σ = 2570979456. Its totient is φ = 856660800.

The previous prime is 1606550503. The next prime is 1606550579. The reversal of 1606550565 is 5650556061.

It is not a de Polignac number, because 1606550565 - 2⁶ = 1606550501 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137035 + ... + 148295.

It is an arithmetic number, because the mean of its divisors is an integer number (160686216).

Almost surely, 2^1606550565 is an apocalyptic number.

1606550565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1606550565 is a deficient number, since it is larger than the sum of its proper divisors (964428891).

1606550565 is a wasteful number, since it uses less digits than its factorization.

1606550565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20780.

The product of its (nonzero) digits is 135000, while the sum is 39.

The square root of 1606550565 is about 40081.7984252204. The cubic root of 1606550565 is about 1171.2010859608.

The spelling of 1606550565 in words is "one billion, six hundred six million, five hundred fifty thousand, five hundred sixty-five".