256350000581 has 4 divisors (see below), whose sum is σ = 256351013664. Its totient is φ = 256348987500.

The previous prime is 256350000559. The next prime is 256350000587. The reversal of 256350000581 is 185000053652.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 256350000581 - 2¹⁰ = 256349999557 is a prime.

It is a super-2 number, since 2×256350000581² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256350000587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230336 + ... + 752166.

It is an arithmetic number, because the mean of its divisors is an integer number (64087753416).

Almost surely, 2^256350000581 is an apocalyptic number.

It is an amenable number.

256350000581 is a deficient number, since it is larger than the sum of its proper divisors (1013083).

256350000581 is an equidigital number, since it uses as much as digits as its factorization.

256350000581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013082.

The product of its (nonzero) digits is 36000, while the sum is 35.

The spelling of 256350000581 in words is "two hundred fifty-six billion, three hundred fifty million, five hundred eighty-one", and thus it is an aban number.