155555 has 8 divisors (see below), whose sum is σ = 190512. Its totient is φ = 121888.

The previous prime is 155539. The next prime is 155557. The reversal of 155555 is 555551.

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

It is a cyclic number.

It is not a de Polignac number, because 155555 - 2⁴ = 155539 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian number.

155555 is a modest number, since divided by 555 gives 155 as remainder.

It is a plaindrome in base 10.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 155555.

It is not an unprimeable number, because it can be changed into a prime (155557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29 + ... + 558.

It is an arithmetic number, because the mean of its divisors is an integer number (23814).

2¹⁵⁵⁵⁵⁵ is an apocalyptic number.

155555 is a deficient number, since it is larger than the sum of its proper divisors (34957).

155555 is an equidigital number, since it uses as much as digits as its factorization.

155555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645.

The product of its digits is 3125, while the sum is 26.

The square root of 155555 is about 394.4046145775. The cubic root of 155555 is about 53.7808908425.

The spelling of 155555 in words is "one hundred fifty-five thousand, five hundred fifty-five".