256516633 has 2 divisors, whose sum is σ = 256516634. Its totient is φ = 256516632.

The previous prime is 256516609. The next prime is 256516643. The reversal of 256516633 is 336615652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148522969 + 107993664 = 12187^2 + 10392^2 .

It is a cyclic number.

It is not a de Polignac number, because 256516633 - 2⁹ = 256516121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256516592 and 256516601.

It is not a weakly prime, because it can be changed into another prime (256516643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128258316 + 128258317.

It is an arithmetic number, because the mean of its divisors is an integer number (128258317).

Almost surely, 2^256516633 is an apocalyptic number.

It is an amenable number.

256516633 is a deficient number, since it is larger than the sum of its proper divisors (1).

256516633 is an equidigital number, since it uses as much as digits as its factorization.

256516633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 97200, while the sum is 37.

The square root of 256516633 is about 16016.1366440225. The cubic root of 256516633 is about 635.3872711530.

The spelling of 256516633 in words is "two hundred fifty-six million, five hundred sixteen thousand, six hundred thirty-three".