668020687480 has 32 divisors (see below), whose sum is σ = 1554875740800. Its totient is φ = 257994196096.

The previous prime is 668020687463. The next prime is 668020687483. The reversal of 668020687480 is 84786020866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668020687483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287938792 + ... + 287941111.

It is an arithmetic number, because the mean of its divisors is an integer number (48589866900).

Almost surely, 2^668020687480 is an apocalyptic number.

It is an amenable number.

668020687480 is an abundant number, since it is smaller than the sum of its proper divisors (886855053320).

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

668020687480 is a wasteful number, since it uses less digits than its factorization.

668020687480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575879943 (or 575879939 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 55.

The spelling of 668020687480 in words is "six hundred sixty-eight billion, twenty million, six hundred eighty-seven thousand, four hundred eighty".