6651566651566 has 16 divisors (see below), whose sum is σ = 10222184054880. Its totient is φ = 3245137781760.

The previous prime is 6651566651539. The next prime is 6651566651567.

6651566651566 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6651566651498 and 6651566651507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6651566651567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241439931 + ... + 241467478.

It is an arithmetic number, because the mean of its divisors is an integer number (638886503430).

Almost surely, 2^{6651566651566} is an apocalyptic number.

6651566651566 is a deficient number, since it is larger than the sum of its proper divisors (3570617403314).

6651566651566 is a wasteful number, since it uses less digits than its factorization.

6651566651566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482907579.

The product of its digits is 174960000, while the sum is 64.

The spelling of 6651566651566 in words is "six trillion, six hundred fifty-one billion, five hundred sixty-six million, six hundred fifty-one thousand, five hundred sixty-six".