66603404966 has 8 divisors (see below), whose sum is σ = 114177265680. Its totient is φ = 28544316408.

The previous prime is 66603404963. The next prime is 66603404971. The reversal of 66603404966 is 66940430666.

It is a happy number.

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

It is a super-2 number, since 2×66603404966² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66603404963) 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, 2378693021 + ... + 2378693048.

It is an arithmetic number, because the mean of its divisors is an integer number (14272158210).

Almost surely, 2^66603404966 is an apocalyptic number.

66603404966 is a deficient number, since it is larger than the sum of its proper divisors (47573860714).

66603404966 is a wasteful number, since it uses less digits than its factorization.

66603404966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4757386078.

The product of its (nonzero) digits is 3359232, while the sum is 50.

The spelling of 66603404966 in words is "sixty-six billion, six hundred three million, four hundred four thousand, nine hundred sixty-six".