256307966883949 has 4 divisors (see below), whose sum is σ = 256657636689436. Its totient is φ = 255958297078464.

The previous prime is 256307966883889. The next prime is 256307966883977. The reversal of 256307966883949 is 949388669703652.

256307966883949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 157437121286025 + 98870845597924 = 12547395^2 + 9943382^2 .

It is a cyclic number.

It is not a de Polignac number, because 256307966883949 - 2⁴⁷ = 115570478528621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256307966883149) 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, 174834901644 + ... + 174834903109.

It is an arithmetic number, because the mean of its divisors is an integer number (64164409172359).

Almost surely, 2^{256307966883949} is an apocalyptic number.

It is an amenable number.

256307966883949 is a deficient number, since it is larger than the sum of its proper divisors (349669805487).

256307966883949 is an equidigital number, since it uses as much as digits as its factorization.

256307966883949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349669805486.

The product of its (nonzero) digits is 25395793920, while the sum is 85.

The spelling of 256307966883949 in words is "two hundred fifty-six trillion, three hundred seven billion, nine hundred sixty-six million, eight hundred eighty-three thousand, nine hundred forty-nine".