256138483455 has 48 divisors (see below), whose sum is σ = 482794625664. Its totient is φ = 125096555520.

The previous prime is 256138483451. The next prime is 256138483487. The reversal of 256138483455 is 554384831652.

256138483455 is a `hidden beast` number, since 2 + 56 + 138 + 4 + 8 + 3 + 455 = 666.

It is not a de Polignac number, because 256138483455 - 2² = 256138483451 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256138483451) 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 47 ways as a sum of consecutive naturals, for example, 4496311 + ... + 4552920.

It is an arithmetic number, because the mean of its divisors is an integer number (10058221368).

Almost surely, 2^256138483455 is an apocalyptic number.

256138483455 is a deficient number, since it is larger than the sum of its proper divisors (226656142209).

256138483455 is a wasteful number, since it uses less digits than its factorization.

256138483455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9049296 (or 9049293 counting only the distinct ones).

The product of its digits is 13824000, while the sum is 54.

The spelling of 256138483455 in words is "two hundred fifty-six billion, one hundred thirty-eight million, four hundred eighty-three thousand, four hundred fifty-five".