1340400040657 has 2 divisors, whose sum is σ = 1340400040658. Its totient is φ = 1340400040656.

The previous prime is 1340400040607. The next prime is 1340400040703. The reversal of 1340400040657 is 7560400040431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 890146962576 + 450253078081 = 943476^2 + 671009^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340400040657 - 2¹¹ = 1340400038609 is a prime.

It is not a weakly prime, because it can be changed into another prime (1340400040607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670200020328 + 670200020329.

It is an arithmetic number, because the mean of its divisors is an integer number (670200020329).

Almost surely, 2^{1340400040657} is an apocalyptic number.

It is an amenable number.

1340400040657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340400040657 is an equidigital number, since it uses as much as digits as its factorization.

1340400040657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 34.

The spelling of 1340400040657 in words is "one trillion, three hundred forty billion, four hundred million, forty thousand, six hundred fifty-seven".