1247740662617 has 2 divisors, whose sum is σ = 1247740662618. Its totient is φ = 1247740662616.

The previous prime is 1247740662589. The next prime is 1247740662653. The reversal of 1247740662617 is 7162660477421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1173536723401 + 74203939216 = 1083299^2 + 272404^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1247740662617 is a prime.

It is a super-2 number, since 2×1247740662617² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1247740662017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623870331308 + 623870331309.

It is an arithmetic number, because the mean of its divisors is an integer number (623870331309).

Almost surely, 2^{1247740662617} is an apocalyptic number.

It is an amenable number.

1247740662617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247740662617 is an equidigital number, since it uses as much as digits as its factorization.

1247740662617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4741632, while the sum is 53.

The spelling of 1247740662617 in words is "one trillion, two hundred forty-seven billion, seven hundred forty million, six hundred sixty-two thousand, six hundred seventeen".