6543761897 has 2 divisors, whose sum is σ = 6543761898. Its totient is φ = 6543761896.

The previous prime is 6543761893. The next prime is 6543761951. The reversal of 6543761897 is 7981673456.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4790162521 + 1753599376 = 69211^2 + 41876^2 .

It is a cyclic number.

It is not a de Polignac number, because 6543761897 - 2² = 6543761893 is a prime.

It is not a weakly prime, because it can be changed into another prime (6543761893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3271880948 + 3271880949.

It is an arithmetic number, because the mean of its divisors is an integer number (3271880949).

Almost surely, 2^6543761897 is an apocalyptic number.

It is an amenable number.

6543761897 is a deficient number, since it is larger than the sum of its proper divisors (1).

6543761897 is an equidigital number, since it uses as much as digits as its factorization.

6543761897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7620480, while the sum is 56.

The square root of 6543761897 is about 80893.5219717871. The cubic root of 6543761897 is about 1870.4344646189.

The spelling of 6543761897 in words is "six billion, five hundred forty-three million, seven hundred sixty-one thousand, eight hundred ninety-seven".