11198705561 has 2 divisors, whose sum is σ = 11198705562. Its totient is φ = 11198705560.

The previous prime is 11198705549. The next prime is 11198705641. The reversal of 11198705561 is 16550789111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11123709961 + 74995600 = 105469^2 + 8660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11198705561 is a prime.

It is a super-2 number, since 2×11198705561² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11198705501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5599352780 + 5599352781.

It is an arithmetic number, because the mean of its divisors is an integer number (5599352781).

Almost surely, 2^11198705561 is an apocalyptic number.

It is an amenable number.

11198705561 is a deficient number, since it is larger than the sum of its proper divisors (1).

11198705561 is an equidigital number, since it uses as much as digits as its factorization.

11198705561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 44.

The spelling of 11198705561 in words is "eleven billion, one hundred ninety-eight million, seven hundred five thousand, five hundred sixty-one".