256134121818 has 32 divisors (see below), whose sum is σ = 543600806400. Its totient is φ = 80281780656.

The previous prime is 256134121811. The next prime is 256134121879. The reversal of 256134121818 is 818121431652.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 256134121818.

It is not an unprimeable number, because it can be changed into a prime (256134121811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15721048 + ... + 15737331.

It is an arithmetic number, because the mean of its divisors is an integer number (16987525200).

Almost surely, 2^256134121818 is an apocalyptic number.

256134121818 is an abundant number, since it is smaller than the sum of its proper divisors (287466684582).

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

256134121818 is a wasteful number, since it uses less digits than its factorization.

256134121818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31458466.

The product of its digits is 92160, while the sum is 42.

The spelling of 256134121818 in words is "two hundred fifty-six billion, one hundred thirty-four million, one hundred twenty-one thousand, eight hundred eighteen".