7666547651566 has 16 divisors (see below), whose sum is σ = 11511597016080. Its totient is φ = 3829348897920.

The previous prime is 7666547651443. The next prime is 7666547651569. The reversal of 7666547651566 is 6651567456667.

It is a junction number, because it is equal to n+sod(n) for n = 7666547651495 and 7666547651504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7666547651569) 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, 105991585 + ... + 106063891.

It is an arithmetic number, because the mean of its divisors is an integer number (719474813505).

Almost surely, 2^{7666547651566} is an apocalyptic number.

7666547651566 is a deficient number, since it is larger than the sum of its proper divisors (3845049364514).

7666547651566 is a wasteful number, since it uses less digits than its factorization.

7666547651566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125859.

The product of its digits is 1143072000, while the sum is 70.

The spelling of 7666547651566 in words is "seven trillion, six hundred sixty-six billion, five hundred forty-seven million, six hundred fifty-one thousand, five hundred sixty-six".