66165728 has 12 divisors (see below), whose sum is σ = 130263840. Its totient is φ = 33082848.

The previous prime is 66165721. The next prime is 66165761. The reversal of 66165728 is 82756166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66165721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1033808 + ... + 1033871.

It is an arithmetic number, because the mean of its divisors is an integer number (10855320).

Almost surely, 2^66165728 is an apocalyptic number.

It is an amenable number.

66165728 is a deficient number, since it is larger than the sum of its proper divisors (64098112).

66165728 is a wasteful number, since it uses less digits than its factorization.

66165728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2067689 (or 2067681 counting only the distinct ones).

The product of its digits is 120960, while the sum is 41.

The square root of 66165728 is about 8134.2318629358. The cubic root of 66165728 is about 404.4619752047.

The spelling of 66165728 in words is "sixty-six million, one hundred sixty-five thousand, seven hundred twenty-eight".