656743123 has 2 divisors, whose sum is σ = 656743124. Its totient is φ = 656743122.

The previous prime is 656743111. The next prime is 656743159. The reversal of 656743123 is 321347656.

656743123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656743123 is a prime.

It is not a weakly prime, because it can be changed into another prime (656743523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328371561 + 328371562.

It is an arithmetic number, because the mean of its divisors is an integer number (328371562).

Almost surely, 2^656743123 is an apocalyptic number.

656743123 is a deficient number, since it is larger than the sum of its proper divisors (1).

656743123 is an equidigital number, since it uses as much as digits as its factorization.

656743123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 37.

The square root of 656743123 is about 25626.9998829360. Note that the first 3 decimals coincide. The cubic root of 656743123 is about 869.2242713200.

The spelling of 656743123 in words is "six hundred fifty-six million, seven hundred forty-three thousand, one hundred twenty-three".