161678166 has 32 divisors (see below), whose sum is σ = 349090560. Its totient is φ = 49624224.

The previous prime is 161678141. The next prime is 161678189. The reversal of 161678166 is 661876161.

It is a super-2 number, since 2×161678166² = 52279658722247112, which contains 22 as substring.

It is a congruent number.

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, 32215 + ... + 36893.

It is an arithmetic number, because the mean of its divisors is an integer number (10909080).

Almost surely, 2^161678166 is an apocalyptic number.

161678166 is an abundant number, since it is smaller than the sum of its proper divisors (187412394).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161678166 is a wasteful number, since it uses less digits than its factorization.

161678166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5140.

The product of its digits is 72576, while the sum is 42.

The square root of 161678166 is about 12715.2729424106. The cubic root of 161678166 is about 544.7749439703.

The spelling of 161678166 in words is "one hundred sixty-one million, six hundred seventy-eight thousand, one hundred sixty-six".