6666544456666 has 8 divisors (see below), whose sum is σ = 10037838802464. Its totient is φ = 3320598189180.

The previous prime is 6666544456651. The next prime is 6666544456687.

It is a happy number.

6666544456666 is nontrivially palindromic in base 10.

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

It is a junction number, because it is equal to n+sod(n) for n = 6666544456595 and 6666544456604.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6337018920 + ... + 6337019971.

It is an arithmetic number, because the mean of its divisors is an integer number (1254729850308).

Almost surely, 2^{6666544456666} is an apocalyptic number.

6666544456666 is a deficient number, since it is larger than the sum of its proper divisors (3371294345798).

6666544456666 is a wasteful number, since it uses less digits than its factorization.

6666544456666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12674039156.

The product of its digits is 2687385600, while the sum is 70.

The spelling of 6666544456666 in words is "six trillion, six hundred sixty-six billion, five hundred forty-four million, four hundred fifty-six thousand, six hundred sixty-six".