243723643231666 has 32 divisors (see below), whose sum is σ = 403171647899328. Its totient is φ = 109787774362560.

The previous prime is 243723643231591. The next prime is 243723643231681. The reversal of 243723643231666 is 666132346327342.

It is a self number, because there is not a number n which added to its sum of digits gives 243723643231666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81935745 + ... + 84858196.

It is an arithmetic number, because the mean of its divisors is an integer number (12599113996854).

Almost surely, 2^{243723643231666} is an apocalyptic number.

243723643231666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

243723643231666 is a deficient number, since it is larger than the sum of its proper divisors (159448004667662).

243723643231666 is a wasteful number, since it uses less digits than its factorization.

243723643231666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166795306.

The product of its digits is 94058496, while the sum is 58.

The spelling of 243723643231666 in words is "two hundred forty-three trillion, seven hundred twenty-three billion, six hundred forty-three million, two hundred thirty-one thousand, six hundred sixty-six".