161655 has 16 divisors (see below), whose sum is σ = 278880. Its totient is φ = 79488.

The previous prime is 161641. The next prime is 161659. The reversal of 161655 is 556161.

It is not a de Polignac number, because 161655 - 2⁴ = 161639 is a prime.

It is a super-2 number, since 2×161655² = 52264678050, which contains 22 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 220 + ... + 609.

It is an arithmetic number, because the mean of its divisors is an integer number (17430).

2¹⁶¹⁶⁵⁵ is an apocalyptic number.

161655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161655 is a deficient number, since it is larger than the sum of its proper divisors (117225).

161655 is a wasteful number, since it uses less digits than its factorization.

161655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850.

The product of its digits is 900, while the sum is 24.

The square root of 161655 is about 402.0634278320. The cubic root of 161655 is about 54.4748923431.

The spelling of 161655 in words is "one hundred sixty-one thousand, six hundred fifty-five".