256305121231203 has 24 divisors (see below), whose sum is σ = 403875925493040. Its totient is φ = 155335979799360.

The previous prime is 256305121231199. The next prime is 256305121231207. The reversal of 256305121231203 is 302132121503652.

256305121231203 is a `hidden beast` number, since 2 + 5 + 6 + 3 + 0 + 512 + 12 + 3 + 120 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (256305121231199) and next prime (256305121231207).

It is not a de Polignac number, because 256305121231203 - 2² = 256305121231199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256305121231207) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31644213 + ... + 38909721.

It is an arithmetic number, because the mean of its divisors is an integer number (16828163562210).

Almost surely, 2^{256305121231203} is an apocalyptic number.

256305121231203 is a deficient number, since it is larger than the sum of its proper divisors (147570804261837).

256305121231203 is a wasteful number, since it uses less digits than its factorization.

256305121231203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7621859 (or 7621856 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

Adding to 256305121231203 its reverse (302132121503652), we get a palindrome (558437242734855).

The spelling of 256305121231203 in words is "two hundred fifty-six trillion, three hundred five billion, one hundred twenty-one million, two hundred thirty-one thousand, two hundred three".