64403664617 has 2 divisors, whose sum is σ = 64403664618. Its totient is φ = 64403664616.

The previous prime is 64403664529. The next prime is 64403664623. The reversal of 64403664617 is 71646630446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33950273536 + 30453391081 = 184256^2 + 174509^2 .

It is a cyclic number.

It is not a de Polignac number, because 64403664617 - 2¹⁰ = 64403663593 is a prime.

It is not a weakly prime, because it can be changed into another prime (64403664217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32201832308 + 32201832309.

It is an arithmetic number, because the mean of its divisors is an integer number (32201832309).

Almost surely, 2^64403664617 is an apocalyptic number.

It is an amenable number.

64403664617 is a deficient number, since it is larger than the sum of its proper divisors (1).

64403664617 is an equidigital number, since it uses as much as digits as its factorization.

64403664617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 47.

The spelling of 64403664617 in words is "sixty-four billion, four hundred three million, six hundred sixty-four thousand, six hundred seventeen".