256734131257133 has 8 divisors (see below), whose sum is σ = 257686095659136. Its totient is φ = 255782200723200.

The previous prime is 256734131257129. The next prime is 256734131257159. The reversal of 256734131257133 is 331752131437652.

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 256734131257133 - 2² = 256734131257129 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256734131257103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6772685 + ... + 23650317.

It is an arithmetic number, because the mean of its divisors is an integer number (32210761957392).

Almost surely, 2^{256734131257133} is an apocalyptic number.

It is an amenable number.

256734131257133 is a deficient number, since it is larger than the sum of its proper divisors (951964402003).

256734131257133 is a wasteful number, since it uses less digits than its factorization.

256734131257133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16934035.

The product of its digits is 9525600, while the sum is 53.

The spelling of 256734131257133 in words is "two hundred fifty-six trillion, seven hundred thirty-four billion, one hundred thirty-one million, two hundred fifty-seven thousand, one hundred thirty-three".