668380839 has 32 divisors (see below), whose sum is σ = 1049018880. Its totient is φ = 370541952.

The previous prime is 668380837. The next prime is 668380849. The reversal of 668380839 is 938083866.

It is not a de Polignac number, because 668380839 - 2¹ = 668380837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 668380791 and 668380800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668380837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 324537 + ... + 326589.

It is an arithmetic number, because the mean of its divisors is an integer number (32781840).

Almost surely, 2^668380839 is an apocalyptic number.

668380839 is a deficient number, since it is larger than the sum of its proper divisors (380638041).

668380839 is a wasteful number, since it uses less digits than its factorization.

668380839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2519.

The product of its (nonzero) digits is 1492992, while the sum is 51.

The square root of 668380839 is about 25853.0624684968. The cubic root of 668380839 is about 874.3285576539.

The spelling of 668380839 in words is "six hundred sixty-eight million, three hundred eighty thousand, eight hundred thirty-nine".