660971311 has 32 divisors (see below), whose sum is σ = 890684928. Its totient is φ = 473696640.

The previous prime is 660971303. The next prime is 660971317. The reversal of 660971311 is 113179066.

It is a cyclic number.

It is not a de Polignac number, because 660971311 - 2³ = 660971303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660971317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 316276 + ... + 318358.

It is an arithmetic number, because the mean of its divisors is an integer number (27833904).

Almost surely, 2^660971311 is an apocalyptic number.

660971311 is a deficient number, since it is larger than the sum of its proper divisors (229713617).

660971311 is a wasteful number, since it uses less digits than its factorization.

660971311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2431.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 660971311 is about 25709.3623219247. The cubic root of 660971311 is about 871.0856710975.

The spelling of 660971311 in words is "six hundred sixty million, nine hundred seventy-one thousand, three hundred eleven".