666896747698666 has 16 divisors (see below), whose sum is σ = 1003213521676800. Its totient is φ = 332492244438960.

The previous prime is 666896747698627. The next prime is 666896747698721.

666896747698666 is nontrivially palindromic in base 10.

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, 576158995 + ... + 577315321.

It is an arithmetic number, because the mean of its divisors is an integer number (62700845104800).

Almost surely, 2^{666896747698666} is an apocalyptic number.

666896747698666 is a deficient number, since it is larger than the sum of its proper divisors (336316773978134).

666896747698666 is a wasteful number, since it uses less digits than its factorization.

666896747698666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1982949.

The product of its digits is 1706597351424, while the sum is 100.

The spelling of 666896747698666 in words is "six hundred sixty-six trillion, eight hundred ninety-six billion, seven hundred forty-seven million, six hundred ninety-eight thousand, six hundred sixty-six".