668040440343 has 4 divisors (see below), whose sum is σ = 890720587128. Its totient is φ = 445360293560.

The previous prime is 668040440297. The next prime is 668040440387. The reversal of 668040440343 is 343044040866.

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

It is a cyclic number.

It is not a de Polignac number, because 668040440343 - 2⁸ = 668040440087 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 668040440295 and 668040440304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668040440393) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 111340073388 + ... + 111340073393.

It is an arithmetic number, because the mean of its divisors is an integer number (222680146782).

Almost surely, 2^668040440343 is an apocalyptic number.

668040440343 is a deficient number, since it is larger than the sum of its proper divisors (222680146785).

668040440343 is a wasteful number, since it uses less digits than its factorization.

668040440343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222680146784.

The product of its (nonzero) digits is 663552, while the sum is 42.

The spelling of 668040440343 in words is "six hundred sixty-eight billion, forty million, four hundred forty thousand, three hundred forty-three".