1616533613 has 4 divisors (see below), whose sum is σ = 1616658588. Its totient is φ = 1616408640.

The previous prime is 1616533601. The next prime is 1616533619. The reversal of 1616533613 is 3163356161.

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 1250117449 + 366416164 = 35357^2 + 19142^2 .

It is a cyclic number.

It is not a de Polignac number, because 1616533613 - 2¹⁴ = 1616517229 is a prime.

It is a super-2 number, since 2×1616533613² = 5226361843917667538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1616533619) 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, 40508 + ... + 69813.

It is an arithmetic number, because the mean of its divisors is an integer number (404164647).

Almost surely, 2^1616533613 is an apocalyptic number.

It is an amenable number.

1616533613 is a deficient number, since it is larger than the sum of its proper divisors (124975).

1616533613 is a wasteful number, since it uses less digits than its factorization.

1616533613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124974.

The product of its digits is 29160, while the sum is 35.

The square root of 1616533613 is about 40206.1389964269. The cubic root of 1616533613 is about 1173.6220122939.

Adding to 1616533613 its reverse (3163356161), we get a palindrome (4779889774).

The spelling of 1616533613 in words is "one billion, six hundred sixteen million, five hundred thirty-three thousand, six hundred thirteen".