1256075122155 has 16 divisors (see below), whose sum is σ = 2296823080704. Its totient is φ = 574205770080.

The previous prime is 1256075122117. The next prime is 1256075122157. The reversal of 1256075122155 is 5512215706521.

It is not a de Polignac number, because 1256075122155 - 2¹⁰ = 1256075121131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1256075122157) 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 15 ways as a sum of consecutive naturals, for example, 5981310001 + ... + 5981310210.

It is an arithmetic number, because the mean of its divisors is an integer number (143551442544).

Almost surely, 2^{1256075122155} is an apocalyptic number.

1256075122155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1256075122155 is a deficient number, since it is larger than the sum of its proper divisors (1040747958549).

1256075122155 is a wasteful number, since it uses less digits than its factorization.

1256075122155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11962620226.

The product of its (nonzero) digits is 210000, while the sum is 42.

The spelling of 1256075122155 in words is "one trillion, two hundred fifty-six billion, seventy-five million, one hundred twenty-two thousand, one hundred fifty-five".