555555985 has 4 divisors (see below), whose sum is σ = 666667188. Its totient is φ = 444444784.

The previous prime is 555555967. The next prime is 555556021. The reversal of 555555985 is 589555555.

It is a happy number.

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 133541136 + 422014849 = 11556^2 + 20543^2 .

It is a cyclic number.

It is not a de Polignac number, because 555555985 - 2⁷ = 555555857 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55555594 + ... + 55555603.

It is an arithmetic number, because the mean of its divisors is an integer number (166666797).

Almost surely, 2^555555985 is an apocalyptic number.

It is an amenable number.

555555985 is a deficient number, since it is larger than the sum of its proper divisors (111111203).

555555985 is a wasteful number, since it uses less digits than its factorization.

555555985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111111202.

The product of its digits is 5625000, while the sum is 52.

The square root of 555555985 is about 23570.2351494422. The cubic root of 555555985 is about 822.0709032637.

The spelling of 555555985 in words is "five hundred fifty-five million, five hundred fifty-five thousand, nine hundred eighty-five".