11061561811 has 2 divisors, whose sum is σ = 11061561812. Its totient is φ = 11061561810.

The previous prime is 11061561767. The next prime is 11061561817. The reversal of 11061561811 is 11816516011.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (11816516011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11061561811 - 2²¹ = 11059464659 is a prime.

It is not a weakly prime, because it can be changed into another prime (11061561817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5530780905 + 5530780906.

It is an arithmetic number, because the mean of its divisors is an integer number (5530780906).

Almost surely, 2^11061561811 is an apocalyptic number.

11061561811 is a deficient number, since it is larger than the sum of its proper divisors (1).

11061561811 is an equidigital number, since it uses as much as digits as its factorization.

11061561811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 31.

The spelling of 11061561811 in words is "eleven billion, sixty-one million, five hundred sixty-one thousand, eight hundred eleven".