668781353530 has 32 divisors (see below), whose sum is σ = 1233266722128. Its totient is φ = 260966860800.

The previous prime is 668781353521. The next prime is 668781353531. The reversal of 668781353530 is 35353187866.

It can be written as a sum of positive squares in 8 ways, for example, as 44363733129 + 624417620401 = 210627^2 + 790201^2 .

It is not an unprimeable number, because it can be changed into a prime (668781353531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5645710 + ... + 5762950.

Almost surely, 2^668781353530 is an apocalyptic number.

668781353530 is a deficient number, since it is larger than the sum of its proper divisors (564485368598).

668781353530 is a wasteful number, since it uses less digits than its factorization.

668781353530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131202.

The product of its (nonzero) digits is 10886400, while the sum is 55.

The spelling of 668781353530 in words is "six hundred sixty-eight billion, seven hundred eighty-one million, three hundred fifty-three thousand, five hundred thirty".