161556055 has 8 divisors (see below), whose sum is σ = 194255712. Its totient is φ = 128985888.

The previous prime is 161556047. The next prime is 161556077. The reversal of 161556055 is 550655161.

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

It is a cyclic number.

It is not a de Polignac number, because 161556055 - 2³ = 161556047 is a prime.

It is a super-2 number, since 2×161556055² = 52200717814326050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161556055.

It is a congruent number.

It is an unprimeable number.

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, 29604 + ... + 34633.

It is an arithmetic number, because the mean of its divisors is an integer number (24281964).

Almost surely, 2^161556055 is an apocalyptic number.

161556055 is a deficient number, since it is larger than the sum of its proper divisors (32699657).

161556055 is an equidigital number, since it uses as much as digits as its factorization.

161556055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64745.

The product of its (nonzero) digits is 22500, while the sum is 34.

The square root of 161556055 is about 12710.4702902764. The cubic root of 161556055 is about 544.6377583306.

The spelling of 161556055 in words is "one hundred sixty-one million, five hundred fifty-six thousand, fifty-five".