561665156011 has 2 divisors, whose sum is σ = 561665156012. Its totient is φ = 561665156010.

The previous prime is 561665155993. The next prime is 561665156047. The reversal of 561665156011 is 110651566165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561665156011 - 2¹³ = 561665147819 is a prime.

It is not a weakly prime, because it can be changed into another prime (561665156911) 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, 280832578005 + 280832578006.

It is an arithmetic number, because the mean of its divisors is an integer number (280832578006).

Almost surely, 2^561665156011 is an apocalyptic number.

561665156011 is a deficient number, since it is larger than the sum of its proper divisors (1).

561665156011 is an equidigital number, since it uses as much as digits as its factorization.

561665156011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162000, while the sum is 43.

The spelling of 561665156011 in words is "five hundred sixty-one billion, six hundred sixty-five million, one hundred fifty-six thousand, eleven".