256631676236245 has 8 divisors (see below), whose sum is σ = 308403681547680. Its totient is φ = 205008227612880.

The previous prime is 256631676236191. The next prime is 256631676236279. The reversal of 256631676236245 is 542632676136652.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-256631676236245 is a prime.

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, 37139168215 + ... + 37139175124.

It is an arithmetic number, because the mean of its divisors is an integer number (38550460193460).

Almost surely, 2^{256631676236245} is an apocalyptic number.

It is an amenable number.

256631676236245 is a deficient number, since it is larger than the sum of its proper divisors (51772005311435).

256631676236245 is an equidigital number, since it uses as much as digits as its factorization.

256631676236245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74278344035.

The product of its digits is 391910400, while the sum is 64.

The spelling of 256631676236245 in words is "two hundred fifty-six trillion, six hundred thirty-one billion, six hundred seventy-six million, two hundred thirty-six thousand, two hundred forty-five".