165556655 has 32 divisors (see below), whose sum is σ = 222462720. Its totient is φ = 117262080.

The previous prime is 165556613. The next prime is 165556663. The reversal of 165556655 is 556655561.

It is not a de Polignac number, because 165556655 - 2¹⁶ = 165491119 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 (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 528779 + ... + 529091.

It is an arithmetic number, because the mean of its divisors is an integer number (6951960).

Almost surely, 2^165556655 is an apocalyptic number.

165556655 is a deficient number, since it is larger than the sum of its proper divisors (56906065).

165556655 is a wasteful number, since it uses less digits than its factorization.

165556655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551.

The product of its digits is 675000, while the sum is 44.

The square root of 165556655 is about 12866.8821009598. The cubic root of 165556655 is about 549.0967598859.

The spelling of 165556655 in words is "one hundred sixty-five million, five hundred fifty-six thousand, six hundred fifty-five".