642523123313 has 2 divisors, whose sum is σ = 642523123314. Its totient is φ = 642523123312.

The previous prime is 642523123283. The next prime is 642523123339. The reversal of 642523123313 is 313321325246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 596884491889 + 45638631424 = 772583^2 + 213632^2 .

It is a cyclic number.

It is not a de Polignac number, because 642523123313 - 2¹⁰ = 642523122289 is a prime.

It is not a weakly prime, because it can be changed into another prime (642523123343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321261561656 + 321261561657.

It is an arithmetic number, because the mean of its divisors is an integer number (321261561657).

Almost surely, 2^642523123313 is an apocalyptic number.

It is an amenable number.

642523123313 is a deficient number, since it is larger than the sum of its proper divisors (1).

642523123313 is an equidigital number, since it uses as much as digits as its factorization.

642523123313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 35.

Adding to 642523123313 its reverse (313321325246), we get a palindrome (955844448559).

The spelling of 642523123313 in words is "six hundred forty-two billion, five hundred twenty-three million, one hundred twenty-three thousand, three hundred thirteen".