66538683566 has 8 divisors (see below), whose sum is σ = 104147504784. Its totient is φ = 31822848640.

The previous prime is 66538683529. The next prime is 66538683599.

It is a happy number.

66538683566 is nontrivially palindromic in base 10.

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

It is a junction number, because it is equal to n+sod(n) for n = 66538683499 and 66538683508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 723246515 + ... + 723246606.

It is an arithmetic number, because the mean of its divisors is an integer number (13018438098).

Almost surely, 2^66538683566 is an apocalyptic number.

66538683566 is a deficient number, since it is larger than the sum of its proper divisors (37608821218).

66538683566 is a wasteful number, since it uses less digits than its factorization.

66538683566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1446493146.

The product of its digits is 111974400, while the sum is 62.

The spelling of 66538683566 in words is "sixty-six billion, five hundred thirty-eight million, six hundred eighty-three thousand, five hundred sixty-six".