6777021613 has 2 divisors, whose sum is σ = 6777021614. Its totient is φ = 6777021612.

The previous prime is 6777021611. The next prime is 6777021689. The reversal of 6777021613 is 3161207776.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5573070409 + 1203951204 = 74653^2 + 34698^2 .

It is a cyclic number.

It is not a de Polignac number, because 6777021613 - 2¹ = 6777021611 is a prime.

Together with 6777021611, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6777021611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3388510806 + 3388510807.

It is an arithmetic number, because the mean of its divisors is an integer number (3388510807).

Almost surely, 2^6777021613 is an apocalyptic number.

It is an amenable number.

6777021613 is a deficient number, since it is larger than the sum of its proper divisors (1).

6777021613 is an equidigital number, since it uses as much as digits as its factorization.

6777021613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 74088, while the sum is 40.

The square root of 6777021613 is about 82322.6676742196. The cubic root of 6777021613 is about 1892.4000763227.

The spelling of 6777021613 in words is "six billion, seven hundred seventy-seven million, twenty-one thousand, six hundred thirteen".