6601963813 has 2 divisors, whose sum is σ = 6601963814. Its totient is φ = 6601963812.

The previous prime is 6601963811. The next prime is 6601963843. The reversal of 6601963813 is 3183691066.

6601963813 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6369157249 + 232806564 = 79807^2 + 15258^2 .

It is a cyclic number.

It is not a de Polignac number, because 6601963813 - 2¹ = 6601963811 is a prime.

It is a super-2 number, since 2×6601963813² = 87171852376322997938, which contains 22 as substring.

Together with 6601963811, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 6601963813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6601963811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3300981906 + 3300981907.

It is an arithmetic number, because the mean of its divisors is an integer number (3300981907).

Almost surely, 2^6601963813 is an apocalyptic number.

It is an amenable number.

6601963813 is a deficient number, since it is larger than the sum of its proper divisors (1).

6601963813 is an equidigital number, since it uses as much as digits as its factorization.

6601963813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 6601963813 is about 81252.4695809303. The cubic root of 6601963813 is about 1875.9634811677.

The spelling of 6601963813 in words is "six billion, six hundred one million, nine hundred sixty-three thousand, eight hundred thirteen".