616808566 has 16 divisors (see below), whose sum is σ = 1024390080. Its totient is φ = 276182280.

The previous prime is 616808561. The next prime is 616808573. The reversal of 616808566 is 665808616.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616808561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207756 + ... + 210703.

It is an arithmetic number, because the mean of its divisors is an integer number (64024380).

Almost surely, 2^616808566 is an apocalyptic number.

616808566 is a deficient number, since it is larger than the sum of its proper divisors (407581514).

616808566 is a wasteful number, since it uses less digits than its factorization.

616808566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418539.

The product of its (nonzero) digits is 414720, while the sum is 46.

The square root of 616808566 is about 24835.6309764822. The cubic root of 616808566 is about 851.2362937181.

Subtracting 616808566 from its reverse (665808616), we obtain a triangular number (49000050 = T₉₈₉₉).

The spelling of 616808566 in words is "six hundred sixteen million, eight hundred eight thousand, five hundred sixty-six".