668851810782 has 16 divisors (see below), whose sum is σ = 1368813008640. Its totient is φ = 217765705752.

The previous prime is 668851810729. The next prime is 668851810787. The reversal of 668851810782 is 287018158866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668851810787) 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, 1296224182 + ... + 1296224697.

It is an arithmetic number, because the mean of its divisors is an integer number (85550813040).

Almost surely, 2^668851810782 is an apocalyptic number.

668851810782 is an abundant number, since it is smaller than the sum of its proper divisors (699961197858).

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

668851810782 is a wasteful number, since it uses less digits than its factorization.

668851810782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2592448927.

The product of its (nonzero) digits is 10321920, while the sum is 60.

The spelling of 668851810782 in words is "six hundred sixty-eight billion, eight hundred fifty-one million, eight hundred ten thousand, seven hundred eighty-two".