161664055 has 16 divisors (see below), whose sum is σ = 222004224. Its totient is φ = 110708640.

The previous prime is 161664049. The next prime is 161664059. The reversal of 161664055 is 550466161.

It is a happy number.

161664055 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 161664055 - 2⁵ = 161664023 is a prime.

It is a super-2 number, since 2×161664055² = 52270533358086050, 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 161664055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161664059) 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, 28290 + ... + 33520.

It is an arithmetic number, because the mean of its divisors is an integer number (13875264).

Almost surely, 2^161664055 is an apocalyptic number.

161664055 is a deficient number, since it is larger than the sum of its proper divisors (60340169).

161664055 is an equidigital number, since it uses as much as digits as its factorization.

161664055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6126.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 161664055 is about 12714.7180464216. The cubic root of 161664055 is about 544.7590944937.

The spelling of 161664055 in words is "one hundred sixty-one million, six hundred sixty-four thousand, fifty-five".