667955721760 has 48 divisors (see below), whose sum is σ = 1646656070976. Its totient is φ = 255565666048.

The previous prime is 667955721703. The next prime is 667955721821. The reversal of 667955721760 is 67127559766.

It is a happy number.

It is an unprimeable number.

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, 90751174 + ... + 90758533.

It is an arithmetic number, because the mean of its divisors is an integer number (34305334812).

Almost surely, 2^667955721760 is an apocalyptic number.

It is an amenable number.

667955721760 is an abundant number, since it is smaller than the sum of its proper divisors (978700349216).

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

667955721760 is a wasteful number, since it uses less digits than its factorization.

667955721760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181509745 (or 181509737 counting only the distinct ones).

The product of its (nonzero) digits is 33339600, while the sum is 61.

The spelling of 667955721760 in words is "six hundred sixty-seven billion, nine hundred fifty-five million, seven hundred twenty-one thousand, seven hundred sixty".