6989909777 has 2 divisors, whose sum is σ = 6989909778. Its totient is φ = 6989909776.

The previous prime is 6989909741. The next prime is 6989909789. The reversal of 6989909777 is 7779099896.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6847728001 + 142181776 = 82751^2 + 11924^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6989909777 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6989909777.

It is not a weakly prime, because it can be changed into another prime (6989905777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3494954888 + 3494954889.

It is an arithmetic number, because the mean of its divisors is an integer number (3494954889).

Almost surely, 2^6989909777 is an apocalyptic number.

It is an amenable number.

6989909777 is a deficient number, since it is larger than the sum of its proper divisors (1).

6989909777 is an equidigital number, since it uses as much as digits as its factorization.

6989909777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108020304, while the sum is 71.

The square root of 6989909777 is about 83605.6802914730. The cubic root of 6989909777 is about 1912.0116025838.

The spelling of 6989909777 in words is "six billion, nine hundred eighty-nine million, nine hundred nine thousand, seven hundred seventy-seven".