1605222505 has 8 divisors (see below), whose sum is σ = 2027649600. Its totient is φ = 1216589616.

The previous prime is 1605222497. The next prime is 1605222547. The reversal of 1605222505 is 5052225061.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1605222505 - 2³ = 1605222497 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8448445 + ... + 8448634.

It is an arithmetic number, because the mean of its divisors is an integer number (253456200).

Almost surely, 2^1605222505 is an apocalyptic number.

It is an amenable number.

1605222505 is a deficient number, since it is larger than the sum of its proper divisors (422427095).

1605222505 is a wasteful number, since it uses less digits than its factorization.

1605222505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16897103.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 1605222505 is about 40065.2281286404. The cubic root of 1605222505 is about 1170.8782713242.

Adding to 1605222505 its reverse (5052225061), we get a palindrome (6657447566).

It can be divided in two parts, 1 and 605222505, that added together give a palindrome (605222506).

The spelling of 1605222505 in words is "one billion, six hundred five million, two hundred twenty-two thousand, five hundred five".