1340440346657 has 2 divisors, whose sum is σ = 1340440346658. Its totient is φ = 1340440346656.

The previous prime is 1340440346653. The next prime is 1340440346677. The reversal of 1340440346657 is 7566430440431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 808064357776 + 532375988881 = 898924^2 + 729641^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340440346657 - 2² = 1340440346653 is a prime.

It is not a weakly prime, because it can be changed into another prime (1340440346653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670220173328 + 670220173329.

It is an arithmetic number, because the mean of its divisors is an integer number (670220173329).

Almost surely, 2^{1340440346657} is an apocalyptic number.

It is an amenable number.

1340440346657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340440346657 is an equidigital number, since it uses as much as digits as its factorization.

1340440346657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2903040, while the sum is 47.

The spelling of 1340440346657 in words is "one trillion, three hundred forty billion, four hundred forty million, three hundred forty-six thousand, six hundred fifty-seven".