6781737921697 has 2 divisors, whose sum is σ = 6781737921698. Its totient is φ = 6781737921696.

The previous prime is 6781737921691. The next prime is 6781737921703. The reversal of 6781737921697 is 7961297371876.

It is a balanced prime because it is at equal distance from previous prime (6781737921691) and next prime (6781737921703).

It can be written as a sum of positive squares in only one way, i.e., 6219956192256 + 561781729441 = 2493984^2 + 749521^2 .

It is a cyclic number.

It is not a de Polignac number, because 6781737921697 - 2³⁹ = 6231982107809 is a prime.

It is not a weakly prime, because it can be changed into another prime (6781737921691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3390868960848 + 3390868960849.

It is an arithmetic number, because the mean of its divisors is an integer number (3390868960849).

Almost surely, 2^{6781737921697} is an apocalyptic number.

It is an amenable number.

6781737921697 is a deficient number, since it is larger than the sum of its proper divisors (1).

6781737921697 is an equidigital number, since it uses as much as digits as its factorization.

6781737921697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336063168, while the sum is 73.

The spelling of 6781737921697 in words is "six trillion, seven hundred eighty-one billion, seven hundred thirty-seven million, nine hundred twenty-one thousand, six hundred ninety-seven".