256403731451 has 4 divisors (see below), whose sum is σ = 293032835952. Its totient is φ = 219774626952.

The previous prime is 256403731439. The next prime is 256403731469. The reversal of 256403731451 is 154137304652.

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 256403731451 - 2¹⁴ = 256403715067 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256403731399 and 256403731408.

It is not an unprimeable number, because it can be changed into a prime (256403731411) 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, 18314552240 + ... + 18314552253.

It is an arithmetic number, because the mean of its divisors is an integer number (73258208988).

Almost surely, 2^256403731451 is an apocalyptic number.

256403731451 is a deficient number, since it is larger than the sum of its proper divisors (36629104501).

256403731451 is an equidigital number, since it uses as much as digits as its factorization.

256403731451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36629104500.

The product of its (nonzero) digits is 302400, while the sum is 41.

The spelling of 256403731451 in words is "two hundred fifty-six billion, four hundred three million, seven hundred thirty-one thousand, four hundred fifty-one".