6777021689 has 2 divisors, whose sum is σ = 6777021690. Its totient is φ = 6777021688.

The previous prime is 6777021613. The next prime is 6777021701. The reversal of 6777021689 is 9861207776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6661824400 + 115197289 = 81620^2 + 10733^2 .

It is a cyclic number.

It is not a de Polignac number, because 6777021689 - 2¹² = 6777017593 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6777021689.

It is not a weakly prime, because it can be changed into another prime (6777021089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3388510844 + 3388510845.

It is an arithmetic number, because the mean of its divisors is an integer number (3388510845).

Almost surely, 2^6777021689 is an apocalyptic number.

It is an amenable number.

6777021689 is a deficient number, since it is larger than the sum of its proper divisors (1).

6777021689 is an equidigital number, since it uses as much as digits as its factorization.

6777021689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1778112, while the sum is 53.

The square root of 6777021689 is about 82322.6681358179. The cubic root of 6777021689 is about 1892.4000833968.

The spelling of 6777021689 in words is "six billion, seven hundred seventy-seven million, twenty-one thousand, six hundred eighty-nine".