668263838826 has 32 divisors (see below), whose sum is σ = 1434532543488. Its totient is φ = 206779461120.

The previous prime is 668263838783. The next prime is 668263838831. The reversal of 668263838826 is 628838362866.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44866570 + ... + 44881461.

It is an arithmetic number, because the mean of its divisors is an integer number (44829141984).

Almost surely, 2^668263838826 is an apocalyptic number.

668263838826 is an abundant number, since it is smaller than the sum of its proper divisors (766268704662).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668263838826 is a wasteful number, since it uses less digits than its factorization.

668263838826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89748126.

The product of its digits is 191102976, while the sum is 66.

The spelling of 668263838826 in words is "six hundred sixty-eight billion, two hundred sixty-three million, eight hundred thirty-eight thousand, eight hundred twenty-six".