256507773454403 has 4 divisors (see below), whose sum is σ = 256839607573488. Its totient is φ = 256175939335320.

The previous prime is 256507773454301. The next prime is 256507773454447. The reversal of 256507773454403 is 304454377705652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256507773454403 - 2⁸ = 256507773454147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256507773453403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165917058383 + ... + 165917059928.

It is an arithmetic number, because the mean of its divisors is an integer number (64209901893372).

Almost surely, 2^{256507773454403} is an apocalyptic number.

256507773454403 is a deficient number, since it is larger than the sum of its proper divisors (331834119085).

256507773454403 is an equidigital number, since it uses as much as digits as its factorization.

256507773454403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331834119084.

The product of its (nonzero) digits is 296352000, while the sum is 62.

The spelling of 256507773454403 in words is "two hundred fifty-six trillion, five hundred seven billion, seven hundred seventy-three million, four hundred fifty-four thousand, four hundred three".