155505165 has 16 divisors (see below), whose sum is σ = 252888576. Its totient is φ = 81576000.

The previous prime is 155505151. The next prime is 155505173. The reversal of 155505165 is 561505551.

It is not a de Polignac number, because 155505165 - 2⁷ = 155505037 is a prime.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 84061 + ... + 85890.

It is an arithmetic number, because the mean of its divisors is an integer number (15805536).

Almost surely, 2^155505165 is an apocalyptic number.

155505165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155505165 is a deficient number, since it is larger than the sum of its proper divisors (97383411).

155505165 is a wasteful number, since it uses less digits than its factorization.

155505165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170020.

The product of its (nonzero) digits is 18750, while the sum is 33.

The square root of 155505165 is about 12470.1710092524. The cubic root of 155505165 is about 537.7514698560.

The spelling of 155505165 in words is "one hundred fifty-five million, five hundred five thousand, one hundred sixty-five".