660847123 has 2 divisors, whose sum is σ = 660847124. Its totient is φ = 660847122.

The previous prime is 660847111. The next prime is 660847133. The reversal of 660847123 is 321748066.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660847123 is a prime.

It is not a weakly prime, because it can be changed into another prime (660847133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330423561 + 330423562.

It is an arithmetic number, because the mean of its divisors is an integer number (330423562).

Almost surely, 2^660847123 is an apocalyptic number.

660847123 is a deficient number, since it is larger than the sum of its proper divisors (1).

660847123 is an equidigital number, since it uses as much as digits as its factorization.

660847123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 660847123 is about 25706.9469793673. The cubic root of 660847123 is about 871.0311124193.

The spelling of 660847123 in words is "six hundred sixty million, eight hundred forty-seven thousand, one hundred twenty-three".