6620013643613 has 8 divisors (see below), whose sum is σ = 6624970943448. Its totient is φ = 6615057363264.

The previous prime is 6620013643609. The next prime is 6620013643637. The reversal of 6620013643613 is 3163463100266.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1370498686489 + 5249514957124 = 1170683^2 + 2291182^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6620013643613 - 2² = 6620013643609 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 (6620013643213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12993995 + ... + 13493847.

It is an arithmetic number, because the mean of its divisors is an integer number (828121367931).

Almost surely, 2^{6620013643613} is an apocalyptic number.

It is an amenable number.

6620013643613 is a deficient number, since it is larger than the sum of its proper divisors (4957299835).

6620013643613 is a wasteful number, since it uses less digits than its factorization.

6620013643613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509743.

The product of its (nonzero) digits is 279936, while the sum is 41.

Adding to 6620013643613 its reverse (3163463100266), we get a palindrome (9783476743879).

The spelling of 6620013643613 in words is "six trillion, six hundred twenty billion, thirteen million, six hundred forty-three thousand, six hundred thirteen".