660873971 has 8 divisors (see below), whose sum is σ = 673659840. Its totient is φ = 648203112.

The previous prime is 660873959. The next prime is 660873989. The reversal of 660873971 is 179378066.

660873971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660873971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660873571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17105 + ... + 40178.

It is an arithmetic number, because the mean of its divisors is an integer number (84207480).

Almost surely, 2^660873971 is an apocalyptic number.

660873971 is a deficient number, since it is larger than the sum of its proper divisors (12785869).

660873971 is a wasteful number, since it uses less digits than its factorization.

660873971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57505.

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 660873971 is about 25707.4691675396. The cubic root of 660873971 is about 871.0429079495.

The spelling of 660873971 in words is "six hundred sixty million, eight hundred seventy-three thousand, nine hundred seventy-one".