256734145452643 has 8 divisors (see below), whose sum is σ = 260251548717888. Its totient is φ = 253216755624384.

The previous prime is 256734145452619. The next prime is 256734145452679. The reversal of 256734145452643 is 346254541437652.

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 256734145452643 - 2¹³ = 256734145444451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256734145452683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38698005 + ... + 44844217.

It is an arithmetic number, because the mean of its divisors is an integer number (32531443589736).

Almost surely, 2^{256734145452643} is an apocalyptic number.

256734145452643 is a deficient number, since it is larger than the sum of its proper divisors (3517403265245).

256734145452643 is an equidigital number, since it uses as much as digits as its factorization.

256734145452643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6718493.

The product of its digits is 290304000, while the sum is 61.

The spelling of 256734145452643 in words is "two hundred fifty-six trillion, seven hundred thirty-four billion, one hundred forty-five million, four hundred fifty-two thousand, six hundred forty-three".