6638694968366 has 8 divisors (see below), whose sum is σ = 9958226109480. Its totient is φ = 3319286265208.

The previous prime is 6638694968357. The next prime is 6638694968369.

6638694968366 is nontrivially palindromic in base 10.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6638694968369) 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, 30473816 + ... + 30690891.

It is an arithmetic number, because the mean of its divisors is an integer number (1244778263685).

Almost surely, 2^{6638694968366} is an apocalyptic number.

6638694968366 is a deficient number, since it is larger than the sum of its proper divisors (3319531141114).

6638694968366 is a wasteful number, since it uses less digits than its factorization.

6638694968366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61218978.

The product of its digits is 8707129344, while the sum is 80.

The spelling of 6638694968366 in words is "six trillion, six hundred thirty-eight billion, six hundred ninety-four million, nine hundred sixty-eight thousand, three hundred sixty-six".