642623422213 has 4 divisors (see below), whose sum is σ = 642637730988. Its totient is φ = 642609113440.

The previous prime is 642623422159. The next prime is 642623422219. The reversal of 642623422213 is 312224326246.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 415377672004 + 227245750209 = 644498^2 + 476703^2 .

It is a cyclic number.

It is not a de Polignac number, because 642623422213 - 2¹³ = 642623414021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642623422219) 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 in 3 ways as a sum of consecutive naturals, for example, 7086808 + ... + 7176913.

It is an arithmetic number, because the mean of its divisors is an integer number (160659432747).

Almost surely, 2^642623422213 is an apocalyptic number.

It is an amenable number.

642623422213 is a deficient number, since it is larger than the sum of its proper divisors (14308775).

642623422213 is a wasteful number, since it uses less digits than its factorization.

642623422213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14308774.

The product of its digits is 165888, while the sum is 37.

Adding to 642623422213 its reverse (312224326246), we get a palindrome (954847748459).

The spelling of 642623422213 in words is "six hundred forty-two billion, six hundred twenty-three million, four hundred twenty-two thousand, two hundred thirteen".