66663773643 has 8 divisors (see below), whose sum is σ = 92749598208. Its totient is φ = 42510232424.

The previous prime is 66663773639. The next prime is 66663773669. The reversal of 66663773643 is 34637736666.

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 66663773643 - 2² = 66663773639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66663773443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 483070755 + ... + 483070892.

It is an arithmetic number, because the mean of its divisors is an integer number (11593699776).

Almost surely, 2^66663773643 is an apocalyptic number.

66663773643 is a deficient number, since it is larger than the sum of its proper divisors (26085824565).

66663773643 is a wasteful number, since it uses less digits than its factorization.

66663773643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 966141673.

The product of its digits is 41150592, while the sum is 57.

The spelling of 66663773643 in words is "sixty-six billion, six hundred sixty-three million, seven hundred seventy-three thousand, six hundred forty-three".