66814361 has 4 divisors (see below), whose sum is σ = 67068672. Its totient is φ = 66560052.

The previous prime is 66814327. The next prime is 66814367. The reversal of 66814361 is 16341866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16341866 = 2 ⋅8170933.

It is a cyclic number.

It is not a de Polignac number, because 66814361 - 2¹⁸ = 66552217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66814367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126761 + ... + 127286.

It is an arithmetic number, because the mean of its divisors is an integer number (16767168).

Almost surely, 2^66814361 is an apocalyptic number.

It is an amenable number.

66814361 is a deficient number, since it is larger than the sum of its proper divisors (254311).

66814361 is a wasteful number, since it uses less digits than its factorization.

66814361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254310.

The product of its digits is 20736, while the sum is 35.

The square root of 66814361 is about 8174.0051994111. The cubic root of 66814361 is about 405.7793477749.

The spelling of 66814361 in words is "sixty-six million, eight hundred fourteen thousand, three hundred sixty-one".