256733340324533 has 4 divisors (see below), whose sum is σ = 256761237034848. Its totient is φ = 256705443614220.

The previous prime is 256733340324521. The next prime is 256733340324541. The reversal of 256733340324533 is 335423043337652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256733340324533 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 (256733340524533) 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, 13948341353 + ... + 13948359758.

It is an arithmetic number, because the mean of its divisors is an integer number (64190309258712).

Almost surely, 2^{256733340324533} is an apocalyptic number.

It is an amenable number.

256733340324533 is a deficient number, since it is larger than the sum of its proper divisors (27896710315).

256733340324533 is an equidigital number, since it uses as much as digits as its factorization.

256733340324533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27896710314.

The product of its (nonzero) digits is 48988800, while the sum is 53.

The spelling of 256733340324533 in words is "two hundred fifty-six trillion, seven hundred thirty-three billion, three hundred forty million, three hundred twenty-four thousand, five hundred thirty-three".