655555 has 4 divisors (see below), whose sum is σ = 786672. Its totient is φ = 524440.

The previous prime is 655547. The next prime is 655559. The reversal of 655555 is 555556.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 655555 - 2³ = 655547 is a prime.

It is a Duffinian number.

655555 is a modest number, since divided by 5555 gives 65 as remainder.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (655559) 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, 65551 + ... + 65560.

It is an arithmetic number, because the mean of its divisors is an integer number (196668).

2⁶⁵⁵⁵⁵⁵ is an apocalyptic number.

655555 is a deficient number, since it is larger than the sum of its proper divisors (131117).

655555 is a wasteful number, since it uses less digits than its factorization.

655555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131116.

The product of its digits is 18750, while the sum is 31.

The square root of 655555 is about 809.6635103548. The cubic root of 655555 is about 86.8699779717.

Subtracting from 655555 its reverse (555556), we obtain a palindrome (99999).

The spelling of 655555 in words is "six hundred fifty-five thousand, five hundred fifty-five".