155205505 has 32 divisors (see below), whose sum is σ = 230275584. Its totient is φ = 97790976.

The previous prime is 155205487. The next prime is 155205517. The reversal of 155205505 is 505502551.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 155205505 - 2²³ = 146816897 is a prime.

It is an unprimeable 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 31 ways as a sum of consecutive naturals, for example, 119017 + ... + 120313.

It is an arithmetic number, because the mean of its divisors is an integer number (7196112).

Almost surely, 2^155205505 is an apocalyptic number.

It is an amenable number.

155205505 is a deficient number, since it is larger than the sum of its proper divisors (75070079).

155205505 is a wasteful number, since it uses less digits than its factorization.

155205505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1585.

The product of its (nonzero) digits is 6250, while the sum is 28.

The square root of 155205505 is about 12458.1501435807. The cubic root of 155205505 is about 537.4058302665.

It can be divided in two parts, 15520 and 5505, that added together give a square (21025 = 145²).

The spelling of 155205505 in words is "one hundred fifty-five million, two hundred five thousand, five hundred five".