561557116363 has 2 divisors, whose sum is σ = 561557116364. Its totient is φ = 561557116362.

The previous prime is 561557116361. The next prime is 561557116427. The reversal of 561557116363 is 363611755165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561557116363 - 2¹ = 561557116361 is a prime.

It is a super-3 number, since 3×561557116363³ (a number of 36 digits) contains 333 as substring.

Together with 561557116361, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (561557116361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280778558181 + 280778558182.

It is an arithmetic number, because the mean of its divisors is an integer number (280778558182).

Almost surely, 2^561557116363 is an apocalyptic number.

561557116363 is a deficient number, since it is larger than the sum of its proper divisors (1).

561557116363 is an equidigital number, since it uses as much as digits as its factorization.

561557116363 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1701000, while the sum is 49.

The spelling of 561557116363 in words is "five hundred sixty-one billion, five hundred fifty-seven million, one hundred sixteen thousand, three hundred sixty-three".