667720127860 has 48 divisors (see below), whose sum is σ = 1494659854800. Its totient is φ = 249689876480.

The previous prime is 667720127839. The next prime is 667720127909. The reversal of 667720127860 is 68721027766.

It can be written as a sum of positive squares in 8 ways, for example, as 80062966116 + 587657161744 = 282954^2 + 766588^2 .

It is a junction number, because it is equal to n+sod(n) for n = 667720127798 and 667720127807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6539551 + ... + 6640870.

It is an arithmetic number, because the mean of its divisors is an integer number (31138746975).

Almost surely, 2^667720127860 is an apocalyptic number.

It is an amenable number.

667720127860 is an abundant number, since it is smaller than the sum of its proper divisors (826939726940).

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

667720127860 is a wasteful number, since it uses less digits than its factorization.

667720127860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13180596 (or 13180594 counting only the distinct ones).

The product of its (nonzero) digits is 2370816, while the sum is 52.

The spelling of 667720127860 in words is "six hundred sixty-seven billion, seven hundred twenty million, one hundred twenty-seven thousand, eight hundred sixty".