66161138 has 8 divisors (see below), whose sum is σ = 99278832. Its totient is φ = 33068196.

The previous prime is 66161131. The next prime is 66161153. The reversal of 66161138 is 83116166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66161131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3581 + ... + 12047.

It is an arithmetic number, because the mean of its divisors is an integer number (12409854).

Almost surely, 2^66161138 is an apocalyptic number.

66161138 is a deficient number, since it is larger than the sum of its proper divisors (33117694).

66161138 is a wasteful number, since it uses less digits than its factorization.

66161138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12376.

The product of its digits is 5184, while the sum is 32.

The square root of 66161138 is about 8133.9497170809. The cubic root of 66161138 is about 404.4526223093.

The spelling of 66161138 in words is "sixty-six million, one hundred sixty-one thousand, one hundred thirty-eight".