668807487408 has 40 divisors (see below), whose sum is σ = 1787330358000. Its totient is φ = 215248386304.

The previous prime is 668807487401. The next prime is 668807487409. The reversal of 668807487408 is 804784708866.

It is not an unprimeable number, because it can be changed into a prime (668807487401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240231183 + ... + 240233966.

It is an arithmetic number, because the mean of its divisors is an integer number (44683258950).

Almost surely, 2^668807487408 is an apocalyptic number.

It is an amenable number.

668807487408 is an abundant number, since it is smaller than the sum of its proper divisors (1118522870592).

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

668807487408 is a wasteful number, since it uses less digits than its factorization.

668807487408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480465189 (or 480465183 counting only the distinct ones).

The product of its (nonzero) digits is 115605504, while the sum is 66.

The spelling of 668807487408 in words is "six hundred sixty-eight billion, eight hundred seven million, four hundred eighty-seven thousand, four hundred eight".