8456437120561 has 2 divisors, whose sum is σ = 8456437120562. Its totient is φ = 8456437120560.

The previous prime is 8456437120511. The next prime is 8456437120631. The reversal of 8456437120561 is 1650217346548.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8138718888336 + 317718232225 = 2852844^2 + 563665^2 .

It is a cyclic number.

It is not a de Polignac number, because 8456437120561 - 2¹⁷ = 8456436989489 is a prime.

It is a super-2 number, since 2×8456437120561² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 8456437120499 and 8456437120508.

It is not a weakly prime, because it can be changed into another prime (8456437120511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4228218560280 + 4228218560281.

It is an arithmetic number, because the mean of its divisors is an integer number (4228218560281).

Almost surely, 2^{8456437120561} is an apocalyptic number.

It is an amenable number.

8456437120561 is a deficient number, since it is larger than the sum of its proper divisors (1).

8456437120561 is an equidigital number, since it uses as much as digits as its factorization.

8456437120561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4838400, while the sum is 52.

The spelling of 8456437120561 in words is "eight trillion, four hundred fifty-six billion, four hundred thirty-seven million, one hundred twenty thousand, five hundred sixty-one".