66946663 has 8 divisors (see below), whose sum is σ = 81011232. Its totient is φ = 54007296.

The previous prime is 66946661. The next prime is 66946687. The reversal of 66946663 is 36664966.

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

It is not a de Polignac number, because 66946663 - 2¹ = 66946661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66946661) 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 7 ways as a sum of consecutive naturals, for example, 281170 + ... + 281407.

It is an arithmetic number, because the mean of its divisors is an integer number (10126404).

Almost surely, 2^66946663 is an apocalyptic number.

66946663 is a deficient number, since it is larger than the sum of its proper divisors (14064569).

66946663 is a wasteful number, since it uses less digits than its factorization.

66946663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562601.

The product of its digits is 839808, while the sum is 46.

The square root of 66946663 is about 8182.0940473695. The cubic root of 66946663 is about 406.0470049196.

It can be divided in two parts, 66 and 946663, that added together give a square (946729 = 973²).

The spelling of 66946663 in words is "sixty-six million, nine hundred forty-six thousand, six hundred sixty-three".