256155420303 has 16 divisors (see below), whose sum is σ = 379532181600. Its totient is φ = 170751078720.

The previous prime is 256155420223. The next prime is 256155420307. The reversal of 256155420303 is 303024551652.

256155420303 is a `hidden beast` number, since 2 + 5 + 615 + 5 + 4 + 2 + 0 + 30 + 3 = 666.

256155420303 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 256155420303 - 2¹⁰ = 256155419279 is a prime.

It is a super-2 number, since 2×256155420303² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256155420307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 286728 + ... + 771053.

It is an arithmetic number, because the mean of its divisors is an integer number (23720761350).

Almost surely, 2^256155420303 is an apocalyptic number.

256155420303 is a deficient number, since it is larger than the sum of its proper divisors (123376761297).

256155420303 is a wasteful number, since it uses less digits than its factorization.

256155420303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066759 (or 1066753 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

Adding to 256155420303 its reverse (303024551652), we get a palindrome (559179971955).

The spelling of 256155420303 in words is "two hundred fifty-six billion, one hundred fifty-five million, four hundred twenty thousand, three hundred three".