256734967479888 has 160 divisors (see below), whose sum is σ = 671914932192000. Its totient is φ = 84463441920000.

The previous prime is 256734967479863. The next prime is 256734967479923. The reversal of 256734967479888 is 888974769437652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6292349088 + ... + 6292389888.

It is an arithmetic number, because the mean of its divisors is an integer number (4199468326200).

Almost surely, 2^{256734967479888} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256734967479888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (335957466096000).

256734967479888 is an abundant number, since it is smaller than the sum of its proper divisors (415179964712112).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256734967479888 is a wasteful number, since it uses less digits than its factorization.

256734967479888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44981 (or 44975 counting only the distinct ones).

The product of its digits is 245806202880, while the sum is 93.

The spelling of 256734967479888 in words is "two hundred fifty-six trillion, seven hundred thirty-four billion, nine hundred sixty-seven million, four hundred seventy-nine thousand, eight hundred eighty-eight".