64517367205 has 16 divisors (see below), whose sum is σ = 77619226608. Its totient is φ = 51481728000.

The previous prime is 64517367181. The next prime is 64517367217. The reversal of 64517367205 is 50276371546.

It can be written as a sum of positive squares in 8 ways, for example, as 4990150881 + 59527216324 = 70641^2 + 243982^2 .

It is not a de Polignac number, because 64517367205 - 2¹⁹ = 64516842917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9264925 + ... + 9271885.

It is an arithmetic number, because the mean of its divisors is an integer number (4851201663).

Almost surely, 2^64517367205 is an apocalyptic number.

It is an amenable number.

64517367205 is a deficient number, since it is larger than the sum of its proper divisors (13101859403).

64517367205 is a wasteful number, since it uses less digits than its factorization.

64517367205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11448.

The product of its (nonzero) digits is 1058400, while the sum is 46.

The spelling of 64517367205 in words is "sixty-four billion, five hundred seventeen million, three hundred sixty-seven thousand, two hundred five".