642245416513 has 4 divisors (see below), whose sum is σ = 642247041220. Its totient is φ = 642243791808.

The previous prime is 642245416507. The next prime is 642245416627. The reversal of 642245416513 is 315614542246.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 497261908224 + 144983508289 = 705168^2 + 380767^2 .

It is a cyclic number.

It is not a de Polignac number, because 642245416513 - 2¹⁷ = 642245285441 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 642245416513.

It is not an unprimeable number, because it can be changed into a prime (642245416013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206773 + ... + 1152061.

It is an arithmetic number, because the mean of its divisors is an integer number (160561760305).

Almost surely, 2^642245416513 is an apocalyptic number.

It is an amenable number.

642245416513 is a deficient number, since it is larger than the sum of its proper divisors (1624707).

642245416513 is an equidigital number, since it uses as much as digits as its factorization.

642245416513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624706.

The product of its digits is 691200, while the sum is 43.

Adding to 642245416513 its reverse (315614542246), we get a palindrome (957859958759).

The spelling of 642245416513 in words is "six hundred forty-two billion, two hundred forty-five million, four hundred sixteen thousand, five hundred thirteen".