668688948080 has 40 divisors (see below), whose sum is σ = 1554740704512. Its totient is φ = 267468886784.

The previous prime is 668688948071. The next prime is 668688948107. The reversal of 668688948080 is 80849886866.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 668688947995 and 668688948013.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4227377 + ... + 4382703.

Almost surely, 2^668688948080 is an apocalyptic number.

It is an amenable number.

668688948080 is an abundant number, since it is smaller than the sum of its proper divisors (886051756432).

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

668688948080 is a wasteful number, since it uses less digits than its factorization.

668688948080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209153 (or 209147 counting only the distinct ones).

The product of its (nonzero) digits is 254803968, while the sum is 71.

The spelling of 668688948080 in words is "six hundred sixty-eight billion, six hundred eighty-eight million, nine hundred forty-eight thousand, eighty".