1663723724866 has 32 divisors (see below), whose sum is σ = 2888378962560. Its totient is φ = 703989259776.

The previous prime is 1663723724851. The next prime is 1663723724879. The reversal of 1663723724866 is 6684273273661.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 892965 + ... + 2030968.

It is an arithmetic number, because the mean of its divisors is an integer number (90261842580).

Almost surely, 2^{1663723724866} is an apocalyptic number.

1663723724866 is a deficient number, since it is larger than the sum of its proper divisors (1224655237694).

1663723724866 is a wasteful number, since it uses less digits than its factorization.

1663723724866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2924458.

The product of its digits is 73156608, while the sum is 61.

The spelling of 1663723724866 in words is "one trillion, six hundred sixty-three billion, seven hundred twenty-three million, seven hundred twenty-four thousand, eight hundred sixty-six".