161242755 has 16 divisors (see below), whose sum is σ = 266885280. Its totient is φ = 83030528.

The previous prime is 161242729. The next prime is 161242771. The reversal of 161242755 is 557242161.

161242755 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 161242755 - 2⁵ = 161242723 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184902 + ... + 185771.

It is an arithmetic number, because the mean of its divisors is an integer number (16680330).

Almost surely, 2^161242755 is an apocalyptic number.

161242755 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161242755 is a deficient number, since it is larger than the sum of its proper divisors (105642525).

161242755 is a wasteful number, since it uses less digits than its factorization.

161242755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370710.

The product of its digits is 16800, while the sum is 33.

The square root of 161242755 is about 12698.1398243995. The cubic root of 161242755 is about 544.2854648581.

The spelling of 161242755 in words is "one hundred sixty-one million, two hundred forty-two thousand, seven hundred fifty-five".