1256085988111 has 4 divisors (see below), whose sum is σ = 1258603195000. Its totient is φ = 1253568781224.

The previous prime is 1256085988109. The next prime is 1256085988159. The reversal of 1256085988111 is 1118895806521.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1256085988111 - 2¹ = 1256085988109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256085988181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1258602696 + ... + 1258603693.

It is an arithmetic number, because the mean of its divisors is an integer number (314650798750).

Almost surely, 2^{1256085988111} is an apocalyptic number.

1256085988111 is a deficient number, since it is larger than the sum of its proper divisors (2517206889).

1256085988111 is an equidigital number, since it uses as much as digits as its factorization.

1256085988111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2517206888.

The product of its (nonzero) digits is 1382400, while the sum is 55.

The spelling of 1256085988111 in words is "one trillion, two hundred fifty-six billion, eighty-five million, nine hundred eighty-eight thousand, one hundred eleven".