64537545602809 has 2 divisors, whose sum is σ = 64537545602810. Its totient is φ = 64537545602808.

The previous prime is 64537545602801. The next prime is 64537545602857. The reversal of 64537545602809 is 90820654573546.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60294790160784 + 4242755442025 = 7764972^2 + 2059795^2 .

It is a cyclic number.

It is not a de Polignac number, because 64537545602809 - 2³ = 64537545602801 is a prime.

It is not a weakly prime, because it can be changed into another prime (64537545602801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32268772801404 + 32268772801405.

It is an arithmetic number, because the mean of its divisors is an integer number (32268772801405).

Almost surely, 2^{64537545602809} is an apocalyptic number.

It is an amenable number.

64537545602809 is a deficient number, since it is larger than the sum of its proper divisors (1).

64537545602809 is an equidigital number, since it uses as much as digits as its factorization.

64537545602809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728000, while the sum is 64.

The spelling of 64537545602809 in words is "sixty-four trillion, five hundred thirty-seven billion, five hundred forty-five million, six hundred two thousand, eight hundred nine".