6867777661 has 2 divisors, whose sum is σ = 6867777662. Its totient is φ = 6867777660.

The previous prime is 6867777613. The next prime is 6867777703. The reversal of 6867777661 is 1667777686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3800722500 + 3067055161 = 61650^2 + 55381^2 .

It is a cyclic number.

It is not a de Polignac number, because 6867777661 - 2²⁷ = 6733559933 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6867777661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6867771661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3433888830 + 3433888831.

It is an arithmetic number, because the mean of its divisors is an integer number (3433888831).

Almost surely, 2^6867777661 is an apocalyptic number.

It is an amenable number.

6867777661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6867777661 is an equidigital number, since it uses as much as digits as its factorization.

6867777661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24893568, while the sum is 61.

The square root of 6867777661 is about 82872.0559718413. The cubic root of 6867777661 is about 1900.8101495215.

The spelling of 6867777661 in words is "six billion, eight hundred sixty-seven million, seven hundred seventy-seven thousand, six hundred sixty-one".