11199545681 has 2 divisors, whose sum is σ = 11199545682. Its totient is φ = 11199545680.

The previous prime is 11199545671. The next prime is 11199545689. The reversal of 11199545681 is 18654599111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10152376081 + 1047169600 = 100759^2 + 32360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11199545681 is a prime.

It is a super-2 number, since 2×11199545681² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11199545689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5599772840 + 5599772841.

It is an arithmetic number, because the mean of its divisors is an integer number (5599772841).

Almost surely, 2^11199545681 is an apocalyptic number.

It is an amenable number.

11199545681 is a deficient number, since it is larger than the sum of its proper divisors (1).

11199545681 is an equidigital number, since it uses as much as digits as its factorization.

11199545681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 388800, while the sum is 50.

The spelling of 11199545681 in words is "eleven billion, one hundred ninety-nine million, five hundred forty-five thousand, six hundred eighty-one".