11111206641 has 4 divisors (see below), whose sum is σ = 14814942192. Its totient is φ = 7407471092.

The previous prime is 11111206633. The next prime is 11111206649. The reversal of 11111206641 is 14660211111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (11111206633) and next prime (11111206649).

It is a cyclic number.

It is not a de Polignac number, because 11111206641 - 2³ = 11111206633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11111206649) 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, 1851867771 + ... + 1851867776.

It is an arithmetic number, because the mean of its divisors is an integer number (3703735548).

Almost surely, 2^11111206641 is an apocalyptic number.

It is an amenable number.

11111206641 is a deficient number, since it is larger than the sum of its proper divisors (3703735551).

11111206641 is an equidigital number, since it uses as much as digits as its factorization.

11111206641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3703735550.

The product of its (nonzero) digits is 288, while the sum is 24.

Adding to 11111206641 its reverse (14660211111), we get a palindrome (25771417752).

The spelling of 11111206641 in words is "eleven billion, one hundred eleven million, two hundred six thousand, six hundred forty-one".