66145185 has 12 divisors (see below), whose sum is σ = 114651732. Its totient is φ = 35277408.

The previous prime is 66145169. The next prime is 66145207. The reversal of 66145185 is 58154166.

It can be written as a sum of positive squares in 2 ways, for example, as 11370384 + 54774801 = 3372^2 + 7401^2 .

It is not a de Polignac number, because 66145185 - 2⁴ = 66145169 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 734902 + ... + 734991.

It is an arithmetic number, because the mean of its divisors is an integer number (9554311).

Almost surely, 2^66145185 is an apocalyptic number.

It is an amenable number.

66145185 is a deficient number, since it is larger than the sum of its proper divisors (48506547).

66145185 is a wasteful number, since it uses less digits than its factorization.

66145185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1469904 (or 1469901 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 66145185 is about 8132.9690150645. The cubic root of 66145185 is about 404.4201120294.

The spelling of 66145185 in words is "sixty-six million, one hundred forty-five thousand, one hundred eighty-five".