256802481369 has 24 divisors (see below), whose sum is σ = 424554162240. Its totient is φ = 146527494048.

The previous prime is 256802481367. The next prime is 256802481407. The reversal of 256802481369 is 963184208652.

256802481369 is a `hidden beast` number, since 2 + 56 + 80 + 2 + 481 + 36 + 9 = 666.

It is not a de Polignac number, because 256802481369 - 2¹ = 256802481367 is a prime.

It is a super-2 number, since 2×256802481369² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256802481367) 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 23 ways as a sum of consecutive naturals, for example, 2967859 + ... + 3053160.

It is an arithmetic number, because the mean of its divisors is an integer number (17689756760).

Almost surely, 2^256802481369 is an apocalyptic number.

It is an amenable number.

256802481369 is a deficient number, since it is larger than the sum of its proper divisors (167751680871).

256802481369 is a wasteful number, since it uses less digits than its factorization.

256802481369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6021709 (or 6021706 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 54.

The spelling of 256802481369 in words is "two hundred fifty-six billion, eight hundred two million, four hundred eighty-one thousand, three hundred sixty-nine".