161687755 has 12 divisors (see below), whose sum is σ = 198254880. Its totient is φ = 126589424.

The previous prime is 161687741. The next prime is 161687791. The reversal of 161687755 is 557786161.

It is not a de Polignac number, because 161687755 - 2⁹ = 161687243 is a prime.

It is a super-2 number, since 2×161687755² = 52285860233880050, which contains 22 as substring.

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 11 ways as a sum of consecutive naturals, for example, 3726 + ... + 18364.

It is an arithmetic number, because the mean of its divisors is an integer number (16521240).

Almost surely, 2^161687755 is an apocalyptic number.

161687755 is a deficient number, since it is larger than the sum of its proper divisors (36567125).

161687755 is an equidigital number, since it uses as much as digits as its factorization.

161687755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14738 (or 14691 counting only the distinct ones).

The product of its digits is 352800, while the sum is 46.

The square root of 161687755 is about 12715.6500030474. The cubic root of 161687755 is about 544.7857138097.

The spelling of 161687755 in words is "one hundred sixty-one million, six hundred eighty-seven thousand, seven hundred fifty-five".