6900779777 has 2 divisors, whose sum is σ = 6900779778. Its totient is φ = 6900779776.

The previous prime is 6900779761. The next prime is 6900779779. The reversal of 6900779777 is 7779770096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3500023921 + 3400755856 = 59161^2 + 58316^2 .

It is a cyclic number.

It is not a de Polignac number, because 6900779777 - 2⁴ = 6900779761 is a prime.

Together with 6900779779, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6900779779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3450389888 + 3450389889.

It is an arithmetic number, because the mean of its divisors is an integer number (3450389889).

Almost surely, 2^6900779777 is an apocalyptic number.

It is an amenable number.

6900779777 is a deficient number, since it is larger than the sum of its proper divisors (1).

6900779777 is an equidigital number, since it uses as much as digits as its factorization.

6900779777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8168202, while the sum is 59.

The square root of 6900779777 is about 83070.9322025460. The cubic root of 6900779777 is about 1903.8499753248.

The spelling of 6900779777 in words is "six billion, nine hundred million, seven hundred seventy-nine thousand, seven hundred seventy-seven".