11258745511781 has 4 divisors (see below), whose sum is σ = 11258861319564. Its totient is φ = 11258629704000.

The previous prime is 11258745511777. The next prime is 11258745511787. The reversal of 11258745511781 is 18711554785211.

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 68609944225 + 11190135567556 = 261935^2 + 3345166^2 .

It is a cyclic number.

It is not a de Polignac number, because 11258745511781 - 2² = 11258745511777 is a prime.

It is a super-2 number, since 2×11258745511781² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11258745511787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57757940 + ... + 57952541.

It is an arithmetic number, because the mean of its divisors is an integer number (2814715329891).

Almost surely, 2^{11258745511781} is an apocalyptic number.

It is an amenable number.

11258745511781 is a deficient number, since it is larger than the sum of its proper divisors (115807783).

11258745511781 is an equidigital number, since it uses as much as digits as its factorization.

11258745511781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115807782.

The product of its digits is 3136000, while the sum is 56.

The spelling of 11258745511781 in words is "eleven trillion, two hundred fifty-eight billion, seven hundred forty-five million, five hundred eleven thousand, seven hundred eighty-one".