256136213503 has 2 divisors, whose sum is σ = 256136213504. Its totient is φ = 256136213502.

The previous prime is 256136213471. The next prime is 256136213527. The reversal of 256136213503 is 305312631652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256136213503 - 2⁵ = 256136213471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256136213603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128068106751 + 128068106752.

It is an arithmetic number, because the mean of its divisors is an integer number (128068106752).

Almost surely, 2^256136213503 is an apocalyptic number.

256136213503 is a deficient number, since it is larger than the sum of its proper divisors (1).

256136213503 is an equidigital number, since it uses as much as digits as its factorization.

256136213503 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 256136213503 in words is "two hundred fifty-six billion, one hundred thirty-six million, two hundred thirteen thousand, five hundred three".