1616521616 has 10 divisors (see below), whose sum is σ = 3132010662. Its totient is φ = 808260800.

The previous prime is 1616521609. The next prime is 1616521649. The reversal of 1616521616 is 6161256161.

It can be written as a sum of positive squares in only one way, i.e., 1616361616 + 160000 = 40204^2 + 400^2 .

It is a super-2 number, since 2×1616521616² = 5226284269990502912, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50516285 + ... + 50516316.

Almost surely, 2^1616521616 is an apocalyptic number.

1616521616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1616521616 is a deficient number, since it is larger than the sum of its proper divisors (1515489046).

1616521616 is a wasteful number, since it uses less digits than its factorization.

1616521616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101032609 (or 101032603 counting only the distinct ones).

The product of its digits is 12960, while the sum is 35.

The square root of 1616521616 is about 40205.9898025157. The cubic root of 1616521616 is about 1173.6191089667.

Adding to 1616521616 its reverse (6161256161), we get a palindrome (7777777777).

The spelling of 1616521616 in words is "one billion, six hundred sixteen million, five hundred twenty-one thousand, six hundred sixteen".