66891419866 has 8 divisors (see below), whose sum is σ = 100339297344. Its totient is φ = 33444987420.

The previous prime is 66891419863. The next prime is 66891419879.

66891419866 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 = 66891419798 and 66891419807.

It is not an unprimeable number, because it can be changed into a prime (66891419863) 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, 236980 + ... + 435823.

It is an arithmetic number, because the mean of its divisors is an integer number (12542412168).

Almost surely, 2^66891419866 is an apocalyptic number.

66891419866 is a deficient number, since it is larger than the sum of its proper divisors (33447877478).

66891419866 is a wasteful number, since it uses less digits than its factorization.

66891419866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722516.

The product of its digits is 26873856, while the sum is 64.

The spelling of 66891419866 in words is "sixty-six billion, eight hundred ninety-one million, four hundred nineteen thousand, eight hundred sixty-six".