1256126755087 has 2 divisors, whose sum is σ = 1256126755088. Its totient is φ = 1256126755086.

The previous prime is 1256126755061. The next prime is 1256126755109. The reversal of 1256126755087 is 7805576216521.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1256126755087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256126755187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628063377543 + 628063377544.

It is an arithmetic number, because the mean of its divisors is an integer number (628063377544).

Almost surely, 2^{1256126755087} is an apocalyptic number.

1256126755087 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256126755087 is an equidigital number, since it uses as much as digits as its factorization.

1256126755087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056000, while the sum is 55.

The spelling of 1256126755087 in words is "one trillion, two hundred fifty-six billion, one hundred twenty-six million, seven hundred fifty-five thousand, eighty-seven".