123000755557 has 2 divisors, whose sum is σ = 123000755558. Its totient is φ = 123000755556.

The previous prime is 123000755519. The next prime is 123000755587. The reversal of 123000755557 is 755557000321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69781033921 + 53219721636 = 264161^2 + 230694^2 .

It is an emirp because it is prime and its reverse (755557000321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123000755557 - 2¹⁹ = 123000231269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123000755587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61500377778 + 61500377779.

It is an arithmetic number, because the mean of its divisors is an integer number (61500377779).

Almost surely, 2^123000755557 is an apocalyptic number.

It is an amenable number.

123000755557 is a deficient number, since it is larger than the sum of its proper divisors (1).

123000755557 is an equidigital number, since it uses as much as digits as its factorization.

123000755557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 183750, while the sum is 40.

Adding to 123000755557 its reverse (755557000321), we get a palindrome (878557755878).

The spelling of 123000755557 in words is "one hundred twenty-three billion, seven hundred fifty-five thousand, five hundred fifty-seven".