6642235613 has 4 divisors (see below), whose sum is σ = 7153176828. Its totient is φ = 6131294400.

The previous prime is 6642235571. The next prime is 6642235651. The reversal of 6642235613 is 3165322466.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3165322466 = 2 ⋅1582661233.

It can be written as a sum of positive squares in 2 ways, for example, as 1981852324 + 4660383289 = 44518^2 + 68267^2 .

It is a cyclic number.

It is not a de Polignac number, because 6642235613 - 2¹⁰ = 6642234589 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 (6642235693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255470588 + ... + 255470613.

It is an arithmetic number, because the mean of its divisors is an integer number (1788294207).

Almost surely, 2^6642235613 is an apocalyptic number.

It is an amenable number.

6642235613 is a deficient number, since it is larger than the sum of its proper divisors (510941215).

6642235613 is a wasteful number, since it uses less digits than its factorization.

6642235613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510941214.

The product of its digits is 155520, while the sum is 38.

The square root of 6642235613 is about 81499.9117361485. The cubic root of 6642235613 is about 1879.7701934471.

The spelling of 6642235613 in words is "six billion, six hundred forty-two million, two hundred thirty-five thousand, six hundred thirteen".