256402450807 has 2 divisors, whose sum is σ = 256402450808. Its totient is φ = 256402450806.

The previous prime is 256402450793. The next prime is 256402450841. The reversal of 256402450807 is 708054204652.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256402450807 - 2⁷ = 256402450679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256402450847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128201225403 + 128201225404.

It is an arithmetic number, because the mean of its divisors is an integer number (128201225404).

Almost surely, 2^256402450807 is an apocalyptic number.

256402450807 is a deficient number, since it is larger than the sum of its proper divisors (1).

256402450807 is an equidigital number, since it uses as much as digits as its factorization.

256402450807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 537600, while the sum is 43.

The spelling of 256402450807 in words is "two hundred fifty-six billion, four hundred two million, four hundred fifty thousand, eight hundred seven".