256520133721245 has 8 divisors (see below), whose sum is σ = 410432213954016. Its totient is φ = 136810737984656.

The previous prime is 256520133721231. The next prime is 256520133721307. The reversal of 256520133721245 is 542127331025652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256520133721245 - 2⁹ = 256520133720733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256520133721194 and 256520133721203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8550671124027 + ... + 8550671124056.

It is an arithmetic number, because the mean of its divisors is an integer number (51304026744252).

Almost surely, 2^{256520133721245} is an apocalyptic number.

It is an amenable number.

256520133721245 is a deficient number, since it is larger than the sum of its proper divisors (153912080232771).

256520133721245 is a wasteful number, since it uses less digits than its factorization.

256520133721245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17101342248091.

The product of its (nonzero) digits is 3024000, while the sum is 48.

Adding to 256520133721245 its reverse (542127331025652), we get a palindrome (798647464746897).

The spelling of 256520133721245 in words is "two hundred fifty-six trillion, five hundred twenty billion, one hundred thirty-three million, seven hundred twenty-one thousand, two hundred forty-five".