668243082838 has 32 divisors (see below), whose sum is σ = 1009516154400. Its totient is φ = 331748641536.

The previous prime is 668243082833. The next prime is 668243082853. The reversal of 668243082838 is 838280342866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668243082833) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 248139420 + ... + 248142112.

It is an arithmetic number, because the mean of its divisors is an integer number (31547379825).

Almost surely, 2^668243082838 is an apocalyptic number.

668243082838 is a deficient number, since it is larger than the sum of its proper divisors (341273071562).

668243082838 is a wasteful number, since it uses less digits than its factorization.

668243082838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4416.

The product of its (nonzero) digits is 21233664, while the sum is 58.

The spelling of 668243082838 in words is "six hundred sixty-eight billion, two hundred forty-three million, eighty-two thousand, eight hundred thirty-eight".