256346430403 has 4 divisors (see below), whose sum is σ = 292967349040. Its totient is φ = 219725511768.

The previous prime is 256346430371. The next prime is 256346430409. The reversal of 256346430403 is 304034643652.

It is a happy number.

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

It is not a de Polignac number, because 256346430403 - 2⁵ = 256346430371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256346430409) 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, 18310459308 + ... + 18310459321.

It is an arithmetic number, because the mean of its divisors is an integer number (73241837260).

Almost surely, 2^256346430403 is an apocalyptic number.

256346430403 is a deficient number, since it is larger than the sum of its proper divisors (36620918637).

256346430403 is an equidigital number, since it uses as much as digits as its factorization.

256346430403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36620918636.

The product of its (nonzero) digits is 622080, while the sum is 40.

The spelling of 256346430403 in words is "two hundred fifty-six billion, three hundred forty-six million, four hundred thirty thousand, four hundred three".