561111166789 has 8 divisors (see below), whose sum is σ = 579236636160. Its totient is φ = 542987266800.

The previous prime is 561111166771. The next prime is 561111166799. The reversal of 561111166789 is 987661111165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 561111166789 - 2⁷ = 561111166661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561111166799) 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 7 ways as a sum of consecutive naturals, for example, 357024 + ... + 1117894.

It is an arithmetic number, because the mean of its divisors is an integer number (72404579520).

Almost surely, 2^561111166789 is an apocalyptic number.

It is an amenable number.

561111166789 is a deficient number, since it is larger than the sum of its proper divisors (18125469371).

561111166789 is a wasteful number, since it uses less digits than its factorization.

561111166789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784691.

The product of its digits is 544320, while the sum is 52.

The spelling of 561111166789 in words is "five hundred sixty-one billion, one hundred eleven million, one hundred sixty-six thousand, seven hundred eighty-nine".