161678164 has 6 divisors (see below), whose sum is σ = 282936794. Its totient is φ = 80839080.

The previous prime is 161678141. The next prime is 161678189. The reversal of 161678164 is 461876161.

It can be written as a sum of positive squares in only one way, i.e., 161493264 + 184900 = 12708^2 + 430^2 .

It is a super-2 number, since 2×161678164² = 52279657428821792, 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 (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20209767 + ... + 20209774.

Almost surely, 2^161678164 is an apocalyptic number.

It is an amenable number.

161678164 is a deficient number, since it is larger than the sum of its proper divisors (121258630).

161678164 is a wasteful number, since it uses less digits than its factorization.

161678164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40419545 (or 40419543 counting only the distinct ones).

The product of its digits is 48384, while the sum is 40.

The square root of 161678164 is about 12715.2728637651. The cubic root of 161678164 is about 544.7749417239.

The spelling of 161678164 in words is "one hundred sixty-one million, six hundred seventy-eight thousand, one hundred sixty-four".