268640331861001 has 4 divisors (see below), whose sum is σ = 268642269836100. Its totient is φ = 268638393885904.

The previous prime is 268640331860897. The next prime is 268640331861007. The reversal of 268640331861001 is 100168133046862.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 120566966129401 + 148073365731600 = 10980299^2 + 12168540^2 .

It is a cyclic number.

It is not a de Polignac number, because 268640331861001 - 2⁹ = 268640331860489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (268640331861007) by changing a digit.

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, 968779606 + ... + 969056863.

It is an arithmetic number, because the mean of its divisors is an integer number (67160567459025).

Almost surely, 2^{268640331861001} is an apocalyptic number.

It is an amenable number.

268640331861001 is a deficient number, since it is larger than the sum of its proper divisors (1937975099).

268640331861001 is a wasteful number, since it uses less digits than its factorization.

268640331861001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1937975098.

The product of its (nonzero) digits is 995328, while the sum is 49.

The spelling of 268640331861001 in words is "two hundred sixty-eight trillion, six hundred forty billion, three hundred thirty-one million, eight hundred sixty-one thousand, one".