66750165 has 24 divisors (see below), whose sum is σ = 117601848. Its totient is φ = 35015040.

The previous prime is 66750139. The next prime is 66750179. The reversal of 66750165 is 56105766.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 848241 + 65901924 = 921^2 + 8118^2 .

It is not a de Polignac number, because 66750165 - 2¹¹ = 66748117 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9414 + ... + 14903.

It is an arithmetic number, because the mean of its divisors is an integer number (4900077).

Almost surely, 2^66750165 is an apocalyptic number.

It is an amenable number.

66750165 is a deficient number, since it is larger than the sum of its proper divisors (50851683).

66750165 is a wasteful number, since it uses less digits than its factorization.

66750165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24389 (or 24386 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 66750165 is about 8170.0774170139. The cubic root of 66750165 is about 405.6493469890.

The spelling of 66750165 in words is "sixty-six million, seven hundred fifty thousand, one hundred sixty-five".