66178741 has 4 divisors (see below), whose sum is σ = 66237292. Its totient is φ = 66120192.

The previous prime is 66178727. The next prime is 66178753. The reversal of 66178741 is 14787166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24304900 + 41873841 = 4930^2 + 6471^2 .

It is a cyclic number.

It is not a de Polignac number, because 66178741 - 2¹⁹ = 65654453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66178694 and 66178703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66172741) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 27546 + ... + 29851.

It is an arithmetic number, because the mean of its divisors is an integer number (16559323).

Almost surely, 2^66178741 is an apocalyptic number.

It is an amenable number.

66178741 is a deficient number, since it is larger than the sum of its proper divisors (58551).

66178741 is a wasteful number, since it uses less digits than its factorization.

66178741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58550.

The product of its digits is 56448, while the sum is 40.

The square root of 66178741 is about 8135.0317147507. The cubic root of 66178741 is about 404.4884890251.

The spelling of 66178741 in words is "sixty-six million, one hundred seventy-eight thousand, seven hundred forty-one".