155506 has 8 divisors (see below), whose sum is σ = 251244. Its totient is φ = 71760.

The previous prime is 155501. The next prime is 155509. The reversal of 155506 is 605551.

It can be written as a sum of positive squares in 2 ways, for example, as 119025 + 36481 = 345^2 + 191^2 .

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

It is not an unprimeable number, because it can be changed into a prime (155501) by changing a digit.

155506 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 3 ways as a sum of consecutive naturals, for example, 2965 + ... + 3016.

2¹⁵⁵⁵⁰⁶ is an apocalyptic number.

155506 is a deficient number, since it is larger than the sum of its proper divisors (95738).

155506 is a wasteful number, since it uses less digits than its factorization.

155506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5996.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 155506 is about 394.3424907362. The cubic root of 155506 is about 53.7752432357.

The spelling of 155506 in words is "one hundred fifty-five thousand, five hundred six".