161166881 has 8 divisors (see below), whose sum is σ = 166520640. Its totient is φ = 155886192.

The previous prime is 161166871. The next prime is 161166899. The reversal of 161166881 is 188661161.

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 161166881 - 2¹⁰ = 161165857 is a prime.

It is a super-2 number, since 2×161166881² = 51949527062536322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161166821) 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 7 ways as a sum of consecutive naturals, for example, 13766 + ... + 22623.

It is an arithmetic number, because the mean of its divisors is an integer number (20815080).

Almost surely, 2^161166881 is an apocalyptic number.

It is an amenable number.

161166881 is a deficient number, since it is larger than the sum of its proper divisors (5353759).

161166881 is a wasteful number, since it uses less digits than its factorization.

161166881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36535.

The product of its digits is 13824, while the sum is 38.

The square root of 161166881 is about 12695.1518699069. The cubic root of 161166881 is about 544.2000789140.

The spelling of 161166881 in words is "one hundred sixty-one million, one hundred sixty-six thousand, eight hundred eighty-one".