161655155 has 16 divisors (see below), whose sum is σ = 203053824. Its totient is φ = 123314400.

The previous prime is 161655149. The next prime is 161655157. The reversal of 161655155 is 551556161.

161655155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161655155 - 2¹² = 161651059 is a prime.

It is a super-2 number, since 2×161655155² = 52264778276148050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161655157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37880 + ... + 41930.

It is an arithmetic number, because the mean of its divisors is an integer number (12690864).

Almost surely, 2^161655155 is an apocalyptic number.

161655155 is a deficient number, since it is larger than the sum of its proper divisors (41398669).

161655155 is a wasteful number, since it uses less digits than its factorization.

161655155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4426.

The product of its digits is 22500, while the sum is 35.

The square root of 161655155 is about 12714.3680535055. The cubic root of 161655155 is about 544.7490975386.

The spelling of 161655155 in words is "one hundred sixty-one million, six hundred fifty-five thousand, one hundred fifty-five".