1561686342263 has 2 divisors, whose sum is σ = 1561686342264. Its totient is φ = 1561686342262.

The previous prime is 1561686342257. The next prime is 1561686342299. The reversal of 1561686342263 is 3622436861651.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1561686342263 is a prime.

It is a super-2 number, since 2×1561686342263² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1561686342233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780843171131 + 780843171132.

It is an arithmetic number, because the mean of its divisors is an integer number (780843171132).

Almost surely, 2^{1561686342263} is an apocalyptic number.

1561686342263 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561686342263 is an equidigital number, since it uses as much as digits as its factorization.

1561686342263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7464960, while the sum is 53.

The spelling of 1561686342263 in words is "one trillion, five hundred sixty-one billion, six hundred eighty-six million, three hundred forty-two thousand, two hundred sixty-three".