6659642469566 has 4 divisors (see below), whose sum is σ = 9989463704352. Its totient is φ = 3329821234782.

The previous prime is 6659642469551. The next prime is 6659642469569.

It is a happy number.

6659642469566 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 6659642469493 and 6659642469502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6659642469569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1664910617390 + ... + 1664910617393.

It is an arithmetic number, because the mean of its divisors is an integer number (2497365926088).

Almost surely, 2^{6659642469566} is an apocalyptic number.

6659642469566 is a deficient number, since it is larger than the sum of its proper divisors (3329821234786).

6659642469566 is a wasteful number, since it uses less digits than its factorization.

6659642469566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3329821234785.

The product of its digits is 3023308800, while the sum is 74.

The spelling of 6659642469566 in words is "six trillion, six hundred fifty-nine billion, six hundred forty-two million, four hundred sixty-nine thousand, five hundred sixty-six".