642313313237 has 2 divisors, whose sum is σ = 642313313238. Its totient is φ = 642313313236.

The previous prime is 642313313221. The next prime is 642313313273. The reversal of 642313313237 is 732313313246.

Together with next prime (642313313273) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 631975710961 + 10337602276 = 794969^2 + 101674^2 .

It is a cyclic number.

It is not a de Polignac number, because 642313313237 - 2⁴ = 642313313221 is a prime.

It is a super-2 number, since 2×642313313237² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 642313313237.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642313313297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321156656618 + 321156656619.

It is an arithmetic number, because the mean of its divisors is an integer number (321156656619).

Almost surely, 2^642313313237 is an apocalyptic number.

It is an amenable number.

642313313237 is a deficient number, since it is larger than the sum of its proper divisors (1).

642313313237 is an equidigital number, since it uses as much as digits as its factorization.

642313313237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 38.

Subtracting 642313313237 from its reverse (732313313246), we obtain a palindrome (90000000009).

The spelling of 642313313237 in words is "six hundred forty-two billion, three hundred thirteen million, three hundred thirteen thousand, two hundred thirty-seven".