6697777897 has 2 divisors, whose sum is σ = 6697777898. Its totient is φ = 6697777896.

The previous prime is 6697777871. The next prime is 6697777907. The reversal of 6697777897 is 7987777966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4837063401 + 1860714496 = 69549^2 + 43136^2 .

It is a cyclic number.

It is not a de Polignac number, because 6697777897 - 2¹¹ = 6697775849 is a prime.

It is not a weakly prime, because it can be changed into another prime (6697777847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3348888948 + 3348888949.

It is an arithmetic number, because the mean of its divisors is an integer number (3348888949).

Almost surely, 2^6697777897 is an apocalyptic number.

It is an amenable number.

6697777897 is a deficient number, since it is larger than the sum of its proper divisors (1).

6697777897 is an equidigital number, since it uses as much as digits as its factorization.

6697777897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 392073696, while the sum is 73.

The square root of 6697777897 is about 81839.9529386473. The cubic root of 6697777897 is about 1884.9951942127.

The spelling of 6697777897 in words is "six billion, six hundred ninety-seven million, seven hundred seventy-seven thousand, eight hundred ninety-seven".