1616565365 has 4 divisors (see below), whose sum is σ = 1939878444. Its totient is φ = 1293252288.

The previous prime is 1616565361. The next prime is 1616565397. The reversal of 1616565365 is 5635656161.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 195049156 + 1421516209 = 13966^2 + 37703^2 .

It is a cyclic number.

It is not a de Polignac number, because 1616565365 - 2² = 1616565361 is a prime.

It is a super-2 number, since 2×1616565365² = 5226567158635166450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616565361) 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, 161656532 + ... + 161656541.

It is an arithmetic number, because the mean of its divisors is an integer number (484969611).

Almost surely, 2^1616565365 is an apocalyptic number.

It is an amenable number.

1616565365 is a deficient number, since it is larger than the sum of its proper divisors (323313079).

1616565365 is an equidigital number, since it uses as much as digits as its factorization.

1616565365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323313078.

The product of its digits is 486000, while the sum is 44.

The square root of 1616565365 is about 40206.5338595607. The cubic root of 1616565365 is about 1173.6296963495.

The spelling of 1616565365 in words is "one billion, six hundred sixteen million, five hundred sixty-five thousand, three hundred sixty-five".