66161944 has 32 divisors (see below), whose sum is σ = 126619920. Its totient is φ = 32403456.

The previous prime is 66161941. The next prime is 66161983. The reversal of 66161944 is 44916166.

66161944 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 not an unprimeable number, because it can be changed into a prime (66161941) 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, 112419 + ... + 113005.

Almost surely, 2^66161944 is an apocalyptic number.

It is an amenable number.

66161944 is a deficient number, since it is larger than the sum of its proper divisors (60457976).

66161944 is a wasteful number, since it uses less digits than its factorization.

66161944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859 (or 855 counting only the distinct ones).

The product of its digits is 31104, while the sum is 37.

The square root of 66161944 is about 8133.9992623555. Note that the first 3 decimals coincide. The cubic root of 66161944 is about 404.4542647009.

The spelling of 66161944 in words is "sixty-six million, one hundred sixty-one thousand, nine hundred forty-four".