1605616065 has 24 divisors (see below), whose sum is σ = 2792924160. Its totient is φ = 853295904.

The previous prime is 1605616063. The next prime is 1605616121. The reversal of 1605616065 is 5606165061.

It is not a de Polignac number, because 1605616065 - 2¹ = 1605616063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1605616063) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 50305 + ... + 75774.

It is an arithmetic number, because the mean of its divisors is an integer number (116371840).

Almost surely, 2^1605616065 is an apocalyptic number.

1605616065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1605616065 is a deficient number, since it is larger than the sum of its proper divisors (1187308095).

1605616065 is a wasteful number, since it uses less digits than its factorization.

1605616065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126373 (or 126370 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 1605616065 is about 40070.1393184501. The cubic root of 1605616065 is about 1170.9739534278.

The spelling of 1605616065 in words is "one billion, six hundred five million, six hundred sixteen thousand, sixty-five".