660851 has 2 divisors, whose sum is σ = 660852. Its totient is φ = 660850.

The previous prime is 660833. The next prime is 660853. The reversal of 660851 is 158066.

660851 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660851 - 2⁶ = 660787 is a prime.

Together with 660853, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 660851.

It is not a weakly prime, because it can be changed into another prime (660853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330425 + 330426.

It is an arithmetic number, because the mean of its divisors is an integer number (330426).

2⁶⁶⁰⁸⁵¹ is an apocalyptic number.

660851 is a deficient number, since it is larger than the sum of its proper divisors (1).

660851 is an equidigital number, since it uses as much as digits as its factorization.

660851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 660851 is about 812.9274260351. The cubic root of 660851 is about 87.1032815779.

The spelling of 660851 in words is "six hundred sixty thousand, eight hundred fifty-one".