161661177 has 80 divisors (see below), whose sum is σ = 278087040. Its totient is φ = 92938752.

The previous prime is 161661161. The next prime is 161661191. The reversal of 161661177 is 771166161.

It is not a de Polignac number, because 161661177 - 2⁴ = 161661161 is a prime.

It is a super-2 number, since 2×161661177² = 52268672298050658, which contains 22 as substring.

Its product of digits (10584) is a multiple of the sum of its prime factors (252).

It is not an unprimeable number, because it can be changed into a prime (161661677) 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 79 ways as a sum of consecutive naturals, for example, 967948 + ... + 968114.

It is an arithmetic number, because the mean of its divisors is an integer number (3476088).

Almost surely, 2^161661177 is an apocalyptic number.

161661177 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

161661177 is a deficient number, since it is larger than the sum of its proper divisors (116425863).

161661177 is a wasteful number, since it uses less digits than its factorization.

161661177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252 (or 243 counting only the distinct ones).

The product of its digits is 10584, while the sum is 36.

The square root of 161661177 is about 12714.6048699910. The cubic root of 161661177 is about 544.7558618106.

The spelling of 161661177 in words is "one hundred sixty-one million, six hundred sixty-one thousand, one hundred seventy-seven".