660531163 has 4 divisors (see below), whose sum is σ = 662022648. Its totient is φ = 659039680.

The previous prime is 660531161. The next prime is 660531169. The reversal of 660531163 is 361135066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 660531163 - 2¹ = 660531161 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660531161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 745078 + ... + 745963.

It is an arithmetic number, because the mean of its divisors is an integer number (165505662).

Almost surely, 2^660531163 is an apocalyptic number.

660531163 is a deficient number, since it is larger than the sum of its proper divisors (1491485).

660531163 is a wasteful number, since it uses less digits than its factorization.

660531163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1491484.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 660531163 is about 25700.8008240988. The cubic root of 660531163 is about 870.8922730150.

The spelling of 660531163 in words is "six hundred sixty million, five hundred thirty-one thousand, one hundred sixty-three".