1256726112555 has 8 divisors (see below), whose sum is σ = 2010761780112. Its totient is φ = 670253926688.

The previous prime is 1256726112547. The next prime is 1256726112569. The reversal of 1256726112555 is 5552116276521.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1256726112555 - 2³ = 1256726112547 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41890870404 + ... + 41890870433.

It is an arithmetic number, because the mean of its divisors is an integer number (251345222514).

Almost surely, 2^{1256726112555} is an apocalyptic number.

1256726112555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1256726112555 is a deficient number, since it is larger than the sum of its proper divisors (754035667557).

1256726112555 is an equidigital number, since it uses as much as digits as its factorization.

1256726112555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83781740845.

The product of its digits is 1260000, while the sum is 48.

The spelling of 1256726112555 in words is "one trillion, two hundred fifty-six billion, seven hundred twenty-six million, one hundred twelve thousand, five hundred fifty-five".