561697688369 has 4 divisors (see below), whose sum is σ = 561707630580. Its totient is φ = 561687746160.

The previous prime is 561697688341. The next prime is 561697688411. The reversal of 561697688369 is 963886796165.

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 436013257969 + 125684430400 = 660313^2 + 354520^2 .

It is a cyclic number.

It is not a de Polignac number, because 561697688369 - 2¹⁶ = 561697622833 is a prime.

It is a super-2 number, since 2×561697688369² (a number of 24 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 = 561697688296 and 561697688305.

It is not an unprimeable number, because it can be changed into a prime (561697688869) 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, 4885874 + ... + 4999515.

It is an arithmetic number, because the mean of its divisors is an integer number (140426907645).

Almost surely, 2^561697688369 is an apocalyptic number.

It is an amenable number.

561697688369 is a deficient number, since it is larger than the sum of its proper divisors (9942211).

561697688369 is an equidigital number, since it uses as much as digits as its factorization.

561697688369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9942210.

The product of its digits is 705438720, while the sum is 74.

The spelling of 561697688369 in words is "five hundred sixty-one billion, six hundred ninety-seven million, six hundred eighty-eight thousand, three hundred sixty-nine".