11220985691 has 2 divisors, whose sum is σ = 11220985692. Its totient is φ = 11220985690.

The previous prime is 11220985687. The next prime is 11220985703. The reversal of 11220985691 is 19658902211.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11220985691 - 2² = 11220985687 is a prime.

It is not a weakly prime, because it can be changed into another prime (11220985651) 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 as a sum of consecutive naturals, namely, 5610492845 + 5610492846.

It is an arithmetic number, because the mean of its divisors is an integer number (5610492846).

Almost surely, 2^11220985691 is an apocalyptic number.

11220985691 is a deficient number, since it is larger than the sum of its proper divisors (1).

11220985691 is an equidigital number, since it uses as much as digits as its factorization.

11220985691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 44.

The spelling of 11220985691 in words is "eleven billion, two hundred twenty million, nine hundred eighty-five thousand, six hundred ninety-one".