123355403257 has 2 divisors, whose sum is σ = 123355403258. Its totient is φ = 123355403256.

The previous prime is 123355403243. The next prime is 123355403299. The reversal of 123355403257 is 752304553321.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112774400761 + 10581002496 = 335819^2 + 102864^2 .

It is an emirp because it is prime and its reverse (752304553321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123355403257 is a prime.

It is not a weakly prime, because it can be changed into another prime (123355403057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61677701628 + 61677701629.

It is an arithmetic number, because the mean of its divisors is an integer number (61677701629).

Almost surely, 2^123355403257 is an apocalyptic number.

It is an amenable number.

123355403257 is a deficient number, since it is larger than the sum of its proper divisors (1).

123355403257 is an equidigital number, since it uses as much as digits as its factorization.

123355403257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378000, while the sum is 40.

Adding to 123355403257 its reverse (752304553321), we get a palindrome (875659956578).

The spelling of 123355403257 in words is "one hundred twenty-three billion, three hundred fifty-five million, four hundred three thousand, two hundred fifty-seven".