66835653866 has 8 divisors (see below), whose sum is σ = 100287952740. Its totient is φ = 33406336288.

The previous prime is 66835653779. The next prime is 66835653889.

It is a happy number.

66835653866 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 66638841025 + 196812841 = 258145^2 + 14029^2 .

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 = 66835653799 and 66835653808.

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, 5738051 + ... + 5749686.

Almost surely, 2^66835653866 is an apocalyptic number.

66835653866 is a deficient number, since it is larger than the sum of its proper divisors (33452298874).

66835653866 is a wasteful number, since it uses less digits than its factorization.

66835653866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11490648.

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

The spelling of 66835653866 in words is "sixty-six billion, eight hundred thirty-five million, six hundred fifty-three thousand, eight hundred sixty-six".