666658282856666 has 16 divisors (see below), whose sum is σ = 1018335175865280. Its totient is φ = 327228766592640.

The previous prime is 666658282856593. The next prime is 666658282856803.

666658282856666 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×666658282856666² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3885503255 + ... + 3885674826.

It is an arithmetic number, because the mean of its divisors is an integer number (63645948491580).

Almost surely, 2^{666658282856666} is an apocalyptic number.

666658282856666 is a deficient number, since it is larger than the sum of its proper divisors (351676893008614).

666658282856666 is a wasteful number, since it uses less digits than its factorization.

666658282856666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7771178869.

The product of its digits is 85996339200, while the sum is 86.

The spelling of 666658282856666 in words is "six hundred sixty-six trillion, six hundred fifty-eight billion, two hundred eighty-two million, eight hundred fifty-six thousand, six hundred sixty-six".