6466878786646 has 8 divisors (see below), whose sum is σ = 9925906974984. Its totient is φ = 3158243128320.

The previous prime is 6466878786601. The next prime is 6466878786649.

6466878786646 is nontrivially palindromic in base 10.

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

It is a self number, because there is not a number n which added to its sum of digits gives 6466878786646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6466878786649) 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, 37598132395 + ... + 37598132566.

It is an arithmetic number, because the mean of its divisors is an integer number (1240738371873).

Almost surely, 2^{6466878786646} is an apocalyptic number.

6466878786646 is a deficient number, since it is larger than the sum of its proper divisors (3459028188338).

6466878786646 is a wasteful number, since it uses less digits than its factorization.

6466878786646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75196265006.

The product of its digits is 18728091648, while the sum is 82.

The spelling of 6466878786646 in words is "six trillion, four hundred sixty-six billion, eight hundred seventy-eight million, seven hundred eighty-six thousand, six hundred forty-six".