123543556481 has 2 divisors, whose sum is σ = 123543556482. Its totient is φ = 123543556480.

The previous prime is 123543556457. The next prime is 123543556483. The reversal of 123543556481 is 184655345321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112600513600 + 10943042881 = 335560^2 + 104609^2 .

It is a cyclic number.

It is not a de Polignac number, because 123543556481 - 2²⁶ = 123476447617 is a prime.

It is a super-2 number, since 2×123543556481² (a number of 23 digits) contains 22 as substring.

Together with 123543556483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123543556483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61771778240 + 61771778241.

It is an arithmetic number, because the mean of its divisors is an integer number (61771778241).

Almost surely, 2^123543556481 is an apocalyptic number.

It is an amenable number.

123543556481 is a deficient number, since it is larger than the sum of its proper divisors (1).

123543556481 is an equidigital number, since it uses as much as digits as its factorization.

123543556481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728000, while the sum is 47.

The spelling of 123543556481 in words is "one hundred twenty-three billion, five hundred forty-three million, five hundred fifty-six thousand, four hundred eighty-one".