1256410053505 has 4 divisors (see below), whose sum is σ = 1507692064212. Its totient is φ = 1005128042800.

The previous prime is 1256410053473. The next prime is 1256410053523. The reversal of 1256410053505 is 5053500146521.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 964811133504 + 291598920001 = 982248^2 + 539999^2 .

It is not a de Polignac number, because 1256410053505 - 2⁵ = 1256410053473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 125641005346 + ... + 125641005355.

It is an arithmetic number, because the mean of its divisors is an integer number (376923016053).

Almost surely, 2^{1256410053505} is an apocalyptic number.

It is an amenable number.

1256410053505 is a deficient number, since it is larger than the sum of its proper divisors (251282010707).

1256410053505 is an equidigital number, since it uses as much as digits as its factorization.

1256410053505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251282010706.

The product of its (nonzero) digits is 90000, while the sum is 37.

The spelling of 1256410053505 in words is "one trillion, two hundred fifty-six billion, four hundred ten million, fifty-three thousand, five hundred five".