11255197661 has 4 divisors (see below), whose sum is σ = 11262246972. Its totient is φ = 11248148352.

The previous prime is 11255197619. The next prime is 11255197663. The reversal of 11255197661 is 16679155211.

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 2284266436 + 8970931225 = 47794^2 + 94715^2 .

It is a cyclic number.

It is not a de Polignac number, because 11255197661 - 2²⁶ = 11188088797 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 (11255197663) 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 3 ways as a sum of consecutive naturals, for example, 3522260 + ... + 3525453.

It is an arithmetic number, because the mean of its divisors is an integer number (2815561743).

Almost surely, 2^11255197661 is an apocalyptic number.

It is an amenable number.

11255197661 is a deficient number, since it is larger than the sum of its proper divisors (7049311).

11255197661 is an equidigital number, since it uses as much as digits as its factorization.

11255197661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7049310.

The product of its digits is 113400, while the sum is 44.

The spelling of 11255197661 in words is "eleven billion, two hundred fifty-five million, one hundred ninety-seven thousand, six hundred sixty-one".