123543556457 has 2 divisors, whose sum is σ = 123543556458. Its totient is φ = 123543556456.

The previous prime is 123543556453. The next prime is 123543556481. The reversal of 123543556457 is 754655345321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118113192976 + 5430363481 = 343676^2 + 73691^2 .

It is an emirp because it is prime and its reverse (754655345321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123543556457 - 2² = 123543556453 is a prime.

It is not a weakly prime, because it can be changed into another prime (123543556453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61771778228 + 61771778229.

It is an arithmetic number, because the mean of its divisors is an integer number (61771778229).

Almost surely, 2^123543556457 is an apocalyptic number.

It is an amenable number.

123543556457 is a deficient number, since it is larger than the sum of its proper divisors (1).

123543556457 is an equidigital number, since it uses as much as digits as its factorization.

123543556457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560000, while the sum is 50.

The spelling of 123543556457 in words is "one hundred twenty-three billion, five hundred forty-three million, five hundred fifty-six thousand, four hundred fifty-seven".