123557240353 has 2 divisors, whose sum is σ = 123557240354. Its totient is φ = 123557240352.

The previous prime is 123557240329. The next prime is 123557240357. The reversal of 123557240353 is 353042755321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113052630289 + 10504610064 = 336233^2 + 102492^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123557240353 is a prime.

It is not a weakly prime, because it can be changed into another prime (123557240357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61778620176 + 61778620177.

It is an arithmetic number, because the mean of its divisors is an integer number (61778620177).

Almost surely, 2^123557240353 is an apocalyptic number.

It is an amenable number.

123557240353 is a deficient number, since it is larger than the sum of its proper divisors (1).

123557240353 is an equidigital number, since it uses as much as digits as its factorization.

123557240353 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 123557240353 its reverse (353042755321), we get a palindrome (476599995674).

The spelling of 123557240353 in words is "one hundred twenty-three billion, five hundred fifty-seven million, two hundred forty thousand, three hundred fifty-three".