155555161 has 8 divisors (see below), whose sum is σ = 156580200. Its totient is φ = 154533888.

The previous prime is 155555149. The next prime is 155555177. The reversal of 155555161 is 161555551.

It can be written as a sum of positive squares in 4 ways, for example, as 145347136 + 10208025 = 12056^2 + 3195^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155555161 is a prime.

It is a super-2 number, since 2×155555161² = 48394816227471842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155555111) 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 7 ways as a sum of consecutive naturals, for example, 147765 + ... + 148813.

It is an arithmetic number, because the mean of its divisors is an integer number (19572525).

Almost surely, 2^155555161 is an apocalyptic number.

It is an amenable number.

155555161 is a deficient number, since it is larger than the sum of its proper divisors (1025039).

155555161 is a wasteful number, since it uses less digits than its factorization.

155555161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1883.

The product of its digits is 18750, while the sum is 34.

The square root of 155555161 is about 12472.1754718253. The cubic root of 155555161 is about 537.8090939693.

The spelling of 155555161 in words is "one hundred fifty-five million, five hundred fifty-five thousand, one hundred sixty-one".