660316261 has 16 divisors (see below), whose sum is σ = 767164608. Its totient is φ = 561683200.

The previous prime is 660316243. The next prime is 660316273. The reversal of 660316261 is 162613066.

660316261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 660316261 - 2¹⁵ = 660283493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660316231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22146 + ... + 42556.

It is an arithmetic number, because the mean of its divisors is an integer number (47947788).

Almost surely, 2^660316261 is an apocalyptic number.

It is an amenable number.

660316261 is a deficient number, since it is larger than the sum of its proper divisors (106848347).

660316261 is a wasteful number, since it uses less digits than its factorization.

660316261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20612.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 660316261 is about 25696.6196415015. The cubic root of 660316261 is about 870.7978153006.

The spelling of 660316261 in words is "six hundred sixty million, three hundred sixteen thousand, two hundred sixty-one".