256361327305 has 4 divisors (see below), whose sum is σ = 307633592772. Its totient is φ = 205089061840.

The previous prime is 256361327297. The next prime is 256361327317. The reversal of 256361327305 is 503723163652.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27658350864 + 228702976441 = 166308^2 + 478229^2 .

It is not a de Polignac number, because 256361327305 - 2³ = 256361327297 is a prime.

It is a super-2 number, since 2×256361327305² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25636132726 + ... + 25636132735.

It is an arithmetic number, because the mean of its divisors is an integer number (76908398193).

Almost surely, 2^256361327305 is an apocalyptic number.

It is an amenable number.

256361327305 is a deficient number, since it is larger than the sum of its proper divisors (51272265467).

256361327305 is an equidigital number, since it uses as much as digits as its factorization.

256361327305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51272265466.

The product of its (nonzero) digits is 680400, while the sum is 43.

The spelling of 256361327305 in words is "two hundred fifty-six billion, three hundred sixty-one million, three hundred twenty-seven thousand, three hundred five".