618216085 has 4 divisors (see below), whose sum is σ = 741859308. Its totient is φ = 494572864.

The previous prime is 618216041. The next prime is 618216089. The reversal of 618216085 is 580612816.

618216085 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 116769636 + 501446449 = 10806^2 + 22393^2 .

It is a cyclic number.

It is not a de Polignac number, because 618216085 - 2¹⁵ = 618183317 is a prime.

It is a super-2 number, since 2×618216085² = 764382255505454450, 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 (618216089) 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, 61821604 + ... + 61821613.

It is an arithmetic number, because the mean of its divisors is an integer number (185464827).

Almost surely, 2^618216085 is an apocalyptic number.

It is an amenable number.

618216085 is a deficient number, since it is larger than the sum of its proper divisors (123643223).

618216085 is a wasteful number, since it uses less digits than its factorization.

618216085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123643222.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 618216085 is about 24863.9515162011. The cubic root of 618216085 is about 851.8832913565.

The spelling of 618216085 in words is "six hundred eighteen million, two hundred sixteen thousand, eighty-five".