684532064666 has 32 divisors (see below), whose sum is σ = 1073924213760. Its totient is φ = 326830420224.

The previous prime is 684532064627. The next prime is 684532064677. The reversal of 684532064666 is 666460235486.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2921711 + ... + 3147293.

It is an arithmetic number, because the mean of its divisors is an integer number (33560131680).

Almost surely, 2^684532064666 is an apocalyptic number.

684532064666 is a deficient number, since it is larger than the sum of its proper divisors (389392149094).

684532064666 is a wasteful number, since it uses less digits than its factorization.

684532064666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226190.

The product of its (nonzero) digits is 29859840, while the sum is 56.

The spelling of 684532064666 in words is "six hundred eighty-four billion, five hundred thirty-two million, sixty-four thousand, six hundred sixty-six".