561265218646169 has 4 divisors (see below), whose sum is σ = 561433817393460. Its totient is φ = 561096619898880.

The previous prime is 561265218646109. The next prime is 561265218646189. The reversal of 561265218646169 is 961646812562165.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 324936243376144 + 236328975270025 = 18025988^2 + 15372995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561265218646169 is a prime.

It is a super-2 number, since 2×561265218646169² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 561265218646099 and 561265218646108.

It is not an unprimeable number, because it can be changed into a prime (561265218646109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84299368652 + ... + 84299375309.

It is an arithmetic number, because the mean of its divisors is an integer number (140358454348365).

Almost surely, 2^{561265218646169} is an apocalyptic number.

It is an amenable number.

561265218646169 is a deficient number, since it is larger than the sum of its proper divisors (168598747291).

561265218646169 is a wasteful number, since it uses less digits than its factorization.

561265218646169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168598747290.

The product of its digits is 223948800, while the sum is 68.

The spelling of 561265218646169 in words is "five hundred sixty-one trillion, two hundred sixty-five billion, two hundred eighteen million, six hundred forty-six thousand, one hundred sixty-nine".