2017964518649 has 2 divisors, whose sum is σ = 2017964518650. Its totient is φ = 2017964518648.

The previous prime is 2017964518643. The next prime is 2017964518657. The reversal of 2017964518649 is 9468154697102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1810477891600 + 207486627049 = 1345540^2 + 455507^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2017964518649 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2017964518591 and 2017964518600.

It is not a weakly prime, because it can be changed into another prime (2017964518643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1008982259324 + 1008982259325.

It is an arithmetic number, because the mean of its divisors is an integer number (1008982259325).

Almost surely, 2^{2017964518649} is an apocalyptic number.

It is an amenable number.

2017964518649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2017964518649 is an equidigital number, since it uses as much as digits as its factorization.

2017964518649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26127360, while the sum is 62.

The spelling of 2017964518649 in words is "two trillion, seventeen billion, nine hundred sixty-four million, five hundred eighteen thousand, six hundred forty-nine".