6664578754666 has 8 divisors (see below), whose sum is σ = 11424992150880. Its totient is φ = 2856248037708.

The previous prime is 6664578754643. The next prime is 6664578754747.

6664578754666 is nontrivially palindromic in base 10.

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

It is a super-2 number, since 2×6664578754666² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6664578754592 and 6664578754601.

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, 238020669796 + ... + 238020669823.

It is an arithmetic number, because the mean of its divisors is an integer number (1428124018860).

Almost surely, 2^{6664578754666} is an apocalyptic number.

6664578754666 is a deficient number, since it is larger than the sum of its proper divisors (4760413396214).

6664578754666 is a wasteful number, since it uses less digits than its factorization.

6664578754666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476041339628.

The product of its digits is 7315660800, while the sum is 76.

The spelling of 6664578754666 in words is "six trillion, six hundred sixty-four billion, five hundred seventy-eight million, seven hundred fifty-four thousand, six hundred sixty-six".