256734252176641 has 4 divisors (see below), whose sum is σ = 256734288092500. Its totient is φ = 256734216260784.

The previous prime is 256734252176629. The next prime is 256734252176729. The reversal of 256734252176641 is 146671252437652.

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 161895188230416 + 94839063946225 = 12723804^2 + 9738535^2 .

It is a cyclic number.

It is not a de Polignac number, because 256734252176641 - 2¹¹ = 256734252174593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256734252176641.

It is not an unprimeable number, because it can be changed into a prime (256734252146641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3184266 + ... + 22882483.

It is an arithmetic number, because the mean of its divisors is an integer number (64183572023125).

Almost surely, 2^{256734252176641} is an apocalyptic number.

It is an amenable number.

256734252176641 is a deficient number, since it is larger than the sum of its proper divisors (35915859).

256734252176641 is an equidigital number, since it uses as much as digits as its factorization.

256734252176641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35915858.

The product of its digits is 101606400, while the sum is 61.

The spelling of 256734252176641 in words is "two hundred fifty-six trillion, seven hundred thirty-four billion, two hundred fifty-two million, one hundred seventy-six thousand, six hundred forty-one".