66814745 has 8 divisors (see below), whose sum is σ = 81374784. Its totient is φ = 52653744.

The previous prime is 66814739. The next prime is 66814757. The reversal of 66814745 is 54741866.

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 66814745 - 2⁶ = 66814681 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99389 + ... + 100058.

It is an arithmetic number, because the mean of its divisors is an integer number (10171848).

Almost surely, 2^66814745 is an apocalyptic number.

It is an amenable number.

66814745 is a deficient number, since it is larger than the sum of its proper divisors (14560039).

66814745 is a wasteful number, since it uses less digits than its factorization.

66814745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199519.

The product of its digits is 161280, while the sum is 41.

The square root of 66814745 is about 8174.0286884742. The cubic root of 66814745 is about 405.7801251476.

The spelling of 66814745 in words is "sixty-six million, eight hundred fourteen thousand, seven hundred forty-five".