663607377318617 has 2 divisors, whose sum is σ = 663607377318618. Its totient is φ = 663607377318616.

The previous prime is 663607377318593. The next prime is 663607377318649. The reversal of 663607377318617 is 716813773706366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 381617944081936 + 281989433236681 = 19535044^2 + 16792541^2 .

It is a cyclic number.

It is not a de Polignac number, because 663607377318617 - 2³⁶ = 663538657841881 is a prime.

It is a super-3 number, since 3×663607377318617³ (a number of 45 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (663607377318317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331803688659308 + 331803688659309.

It is an arithmetic number, because the mean of its divisors is an integer number (331803688659309).

Almost surely, 2^{663607377318617} is an apocalyptic number.

It is an amenable number.

663607377318617 is a deficient number, since it is larger than the sum of its proper divisors (1).

663607377318617 is an equidigital number, since it uses as much as digits as its factorization.

663607377318617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672126336, while the sum is 71.

The spelling of 663607377318617 in words is "six hundred sixty-three trillion, six hundred seven billion, three hundred seventy-seven million, three hundred eighteen thousand, six hundred seventeen".