66187145 has 8 divisors (see below), whose sum is σ = 79766856. Its totient is φ = 52721536.

The previous prime is 66187111. The next prime is 66187157. The reversal of 66187145 is 54178166.

It can be written as a sum of positive squares in 4 ways, for example, as 15264649 + 50922496 = 3907^2 + 7136^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 66187145 - 2¹⁶ = 66121609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66187099 and 66187108.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27242 + ... + 29571.

It is an arithmetic number, because the mean of its divisors is an integer number (9970857).

Almost surely, 2^66187145 is an apocalyptic number.

It is an amenable number.

66187145 is a deficient number, since it is larger than the sum of its proper divisors (13579711).

66187145 is a wasteful number, since it uses less digits than its factorization.

66187145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57051.

The product of its digits is 40320, while the sum is 38.

The square root of 66187145 is about 8135.5482298368. The cubic root of 66187145 is about 404.5056102200.

The spelling of 66187145 in words is "sixty-six million, one hundred eighty-seven thousand, one hundred forty-five".