561326666109 has 8 divisors (see below), whose sum is σ = 816475150752. Its totient is φ = 340197979440.

The previous prime is 561326666107. The next prime is 561326666137. The reversal of 561326666109 is 901666623165.

It is a happy number.

561326666109 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 561326666109 - 2¹ = 561326666107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561326666107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8504949454 + ... + 8504949519.

It is an arithmetic number, because the mean of its divisors is an integer number (102059393844).

Almost surely, 2^561326666109 is an apocalyptic number.

It is an amenable number.

561326666109 is a deficient number, since it is larger than the sum of its proper divisors (255148484643).

561326666109 is a wasteful number, since it uses less digits than its factorization.

561326666109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17009898987.

The product of its (nonzero) digits is 2099520, while the sum is 51.

The spelling of 561326666109 in words is "five hundred sixty-one billion, three hundred twenty-six million, six hundred sixty-six thousand, one hundred nine".