668040440348 has 6 divisors (see below), whose sum is σ = 1169070770616. Its totient is φ = 334020220172.

The previous prime is 668040440297. The next prime is 668040440387. The reversal of 668040440348 is 843044040866.

It is a super-2 number, since 2×668040440348² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83505055040 + ... + 83505055047.

It is an arithmetic number, because the mean of its divisors is an integer number (194845128436).

Almost surely, 2^668040440348 is an apocalyptic number.

It is an amenable number.

668040440348 is a deficient number, since it is larger than the sum of its proper divisors (501030330268).

668040440348 is a wasteful number, since it uses less digits than its factorization.

668040440348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167010110091 (or 167010110089 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 47.

The spelling of 668040440348 in words is "six hundred sixty-eight billion, forty million, four hundred forty thousand, three hundred forty-eight".