6767887661 has 2 divisors, whose sum is σ = 6767887662. Its totient is φ = 6767887660.

The previous prime is 6767887657. The next prime is 6767887681. The reversal of 6767887661 is 1667887676.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4760310025 + 2007577636 = 68995^2 + 44806^2 .

It is a cyclic number.

It is not a de Polignac number, because 6767887661 - 2² = 6767887657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6767887594 and 6767887603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6767887681) 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, 3383943830 + 3383943831.

It is an arithmetic number, because the mean of its divisors is an integer number (3383943831).

Almost surely, 2^6767887661 is an apocalyptic number.

It is an amenable number.

6767887661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6767887661 is an equidigital number, since it uses as much as digits as its factorization.

6767887661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28449792, while the sum is 62.

The square root of 6767887661 is about 82267.1724383426. The cubic root of 6767887661 is about 1891.5495127672.

The spelling of 6767887661 in words is "six billion, seven hundred sixty-seven million, eight hundred eighty-seven thousand, six hundred sixty-one".