256049369489 has 8 divisors (see below), whose sum is σ = 271118229480. Its totient is φ = 240981302016.

The previous prime is 256049369453. The next prime is 256049369501. The reversal of 256049369489 is 984963940652.

It can be written as a sum of positive squares in 4 ways, for example, as 814246225 + 255235123264 = 28535^2 + 505208^2 .

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 256049369489 - 2²⁴ = 256032592273 is a prime.

It is a super-2 number, since 2×256049369489² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256049389489) 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, 547187 + ... + 900839.

It is an arithmetic number, because the mean of its divisors is an integer number (33889778685).

Almost surely, 2^256049369489 is an apocalyptic number.

It is an amenable number.

256049369489 is a deficient number, since it is larger than the sum of its proper divisors (15068859991).

256049369489 is a wasteful number, since it uses less digits than its factorization.

256049369489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396259.

The product of its (nonzero) digits is 100776960, while the sum is 65.

The spelling of 256049369489 in words is "two hundred fifty-six billion, forty-nine million, three hundred sixty-nine thousand, four hundred eighty-nine".