256505066534142 has 24 divisors (see below), whose sum is σ = 556035156641016. Its totient is φ = 85459507436976.

The previous prime is 256505066534141. The next prime is 256505066534191. The reversal of 256505066534142 is 241435660505652.

256505066534142 is a `hidden beast` number, since 2 + 5 + 6 + 5 + 0 + 5 + 0 + 66 + 534 + 1 + 42 = 666.

It is a super-2 number, since 2×256505066534142² (a number of 30 digits) contains 22 as substring.

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 (256505066534141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3515079813 + ... + 3515152784.

It is an arithmetic number, because the mean of its divisors is an integer number (23168131526709).

Almost surely, 2^{256505066534142} is an apocalyptic number.

256505066534142 is an abundant number, since it is smaller than the sum of its proper divisors (299530090106874).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256505066534142 is a wasteful number, since it uses less digits than its factorization.

256505066534142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7030234632 (or 7030234629 counting only the distinct ones).

The product of its (nonzero) digits is 25920000, while the sum is 54.

The spelling of 256505066534142 in words is "two hundred fifty-six trillion, five hundred five billion, sixty-six million, five hundred thirty-four thousand, one hundred forty-two".