161881654 has 16 divisors (see below), whose sum is σ = 274032720. Its totient is φ = 71044960.

The previous prime is 161881649. The next prime is 161881669. The reversal of 161881654 is 456188161.

161881654 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126229 + ... + 127504.

It is an arithmetic number, because the mean of its divisors is an integer number (17127045).

Almost surely, 2^161881654 is an apocalyptic number.

161881654 is a deficient number, since it is larger than the sum of its proper divisors (112151066).

161881654 is a wasteful number, since it uses less digits than its factorization.

161881654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253775.

The product of its digits is 46080, while the sum is 40.

The square root of 161881654 is about 12723.2721420238. The cubic root of 161881654 is about 545.0033992437.

The spelling of 161881654 in words is "one hundred sixty-one million, eight hundred eighty-one thousand, six hundred fifty-four".