64651707289 has 9 divisors (see below), whose sum is σ = 70011049503. Its totient is φ = 59675447832.

The previous prime is 64651707259. The next prime is 64651707301. The reversal of 64651707289 is 98270715646.

The square root of 64651707289 is 254267.

It is a perfect power (a square), and thus also a powerful number.

64651707289 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 9563862025 + 55087845264 = 97795^2 + 234708^2 .

It is not a de Polignac number, because 64651707289 - 2⁵ = 64651707257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64651707209) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3295692 + ... + 3315250.

Almost surely, 2^64651707289 is an apocalyptic number.

64651707289 is the 254267-th square number.

64651707289 is the 127134-th centered octagonal number.

It is an amenable number.

64651707289 is a deficient number, since it is larger than the sum of its proper divisors (5359342214).

64651707289 is an frugal number, since it uses more digits than its factorization.

64651707289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39144 (or 19572 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 55.

The spelling of 64651707289 in words is "sixty-four billion, six hundred fifty-one million, seven hundred seven thousand, two hundred eighty-nine".