561211011011 has 12 divisors (see below), whose sum is σ = 653059595160. Its totient is φ = 480874212000.

The previous prime is 561211011007. The next prime is 561211011017. The reversal of 561211011011 is 110110112165.

It is not a de Polignac number, because 561211011011 - 2² = 561211011007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561211011017) 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 in 11 ways as a sum of consecutive naturals, for example, 1804490 + ... + 2092511.

It is an arithmetic number, because the mean of its divisors is an integer number (54421632930).

Almost surely, 2^561211011011 is an apocalyptic number.

561211011011 is a deficient number, since it is larger than the sum of its proper divisors (91848584149).

561211011011 is a wasteful number, since it uses less digits than its factorization.

561211011011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3899954 (or 3899947 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 20.

Adding to 561211011011 its reverse (110110112165), we get a palindrome (671321123176).

The spelling of 561211011011 in words is "five hundred sixty-one billion, two hundred eleven million, eleven thousand, eleven".