668820722 has 16 divisors (see below), whose sum is σ = 1037256192. Its totient is φ = 323103360.

The previous prime is 668820721. The next prime is 668820751. The reversal of 668820722 is 227028866.

It is a self number, because there is not a number n which added to its sum of digits gives 668820722.

It is not an unprimeable number, because it can be changed into a prime (668820721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31778 + ... + 48450.

It is an arithmetic number, because the mean of its divisors is an integer number (64828512).

Almost surely, 2^668820722 is an apocalyptic number.

668820722 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

668820722 is a deficient number, since it is larger than the sum of its proper divisors (368435470).

668820722 is a wasteful number, since it uses less digits than its factorization.

668820722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17353.

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 668820722 is about 25861.5684365817. The cubic root of 668820722 is about 874.5203235376.

The spelling of 668820722 in words is "six hundred sixty-eight million, eight hundred twenty thousand, seven hundred twenty-two".