648160916281 has 2 divisors, whose sum is σ = 648160916282. Its totient is φ = 648160916280.

The previous prime is 648160916261. The next prime is 648160916321. The reversal of 648160916281 is 182619061846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 401043558400 + 247117357881 = 633280^2 + 497109^2 .

It is a cyclic number.

It is not a de Polignac number, because 648160916281 - 2³¹ = 646013432633 is a prime.

It is a super-4 number, since 4×648160916281⁴ (a number of 48 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (648160916231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324080458140 + 324080458141.

It is an arithmetic number, because the mean of its divisors is an integer number (324080458141).

Almost surely, 2^648160916281 is an apocalyptic number.

It is an amenable number.

648160916281 is a deficient number, since it is larger than the sum of its proper divisors (1).

648160916281 is an equidigital number, since it uses as much as digits as its factorization.

648160916281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 52.

The spelling of 648160916281 in words is "six hundred forty-eight billion, one hundred sixty million, nine hundred sixteen thousand, two hundred eighty-one".