616818385 has 8 divisors (see below), whose sum is σ = 740512296. Its totient is φ = 493234560.

The previous prime is 616818383. The next prime is 616818403. The reversal of 616818385 is 583818616.

616818385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 269517889 + 347300496 = 16417^2 + 18636^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 616818385 - 2¹ = 616818383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (616818383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14644 + ... + 38053.

It is an arithmetic number, because the mean of its divisors is an integer number (92564037).

Almost surely, 2^616818385 is an apocalyptic number.

It is an amenable number.

616818385 is a deficient number, since it is larger than the sum of its proper divisors (123693911).

616818385 is a wasteful number, since it uses less digits than its factorization.

616818385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55043.

The product of its digits is 276480, while the sum is 46.

The square root of 616818385 is about 24835.8286553922. The cubic root of 616818385 is about 851.2408106489.

The spelling of 616818385 in words is "six hundred sixteen million, eight hundred eighteen thousand, three hundred eighty-five".