256616473 has 2 divisors, whose sum is σ = 256616474. Its totient is φ = 256616472.

The previous prime is 256616471. The next prime is 256616483. The reversal of 256616473 is 374616652.

256616473 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 can be written as a sum of positive squares in only one way, i.e., 135792409 + 120824064 = 11653^2 + 10992^2 .

It is a cyclic number.

It is not a de Polignac number, because 256616473 - 2¹ = 256616471 is a prime.

Together with 256616471, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (256616471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128308236 + 128308237.

It is an arithmetic number, because the mean of its divisors is an integer number (128308237).

Almost surely, 2^256616473 is an apocalyptic number.

It is an amenable number.

256616473 is a deficient number, since it is larger than the sum of its proper divisors (1).

256616473 is an equidigital number, since it uses as much as digits as its factorization.

256616473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 40.

The square root of 256616473 is about 16019.2531973248. The cubic root of 256616473 is about 635.4696944459.

The spelling of 256616473 in words is "two hundred fifty-six million, six hundred sixteen thousand, four hundred seventy-three".