268644381638 has 8 divisors (see below), whose sum is σ = 420486858288. Its totient is φ = 128482095544.

The previous prime is 268644381619. The next prime is 268644381641. The reversal of 268644381638 is 836183446862.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2920047581 + ... + 2920047672.

It is an arithmetic number, because the mean of its divisors is an integer number (52560857286).

Almost surely, 2^268644381638 is an apocalyptic number.

268644381638 is a deficient number, since it is larger than the sum of its proper divisors (151842476650).

268644381638 is a wasteful number, since it uses less digits than its factorization.

268644381638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5840095278.

The product of its digits is 31850496, while the sum is 59.

The spelling of 268644381638 in words is "two hundred sixty-eight billion, six hundred forty-four million, three hundred eighty-one thousand, six hundred thirty-eight".