64261745173 has 2 divisors, whose sum is σ = 64261745174. Its totient is φ = 64261745172.

The previous prime is 64261745159. The next prime is 64261745189. The reversal of 64261745173 is 37154716246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64149745284 + 111999889 = 253278^2 + 10583^2 .

It is a cyclic number.

It is not a de Polignac number, because 64261745173 - 2¹⁷ = 64261614101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64261745113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32130872586 + 32130872587.

It is an arithmetic number, because the mean of its divisors is an integer number (32130872587).

Almost surely, 2^64261745173 is an apocalyptic number.

It is an amenable number.

64261745173 is a deficient number, since it is larger than the sum of its proper divisors (1).

64261745173 is an equidigital number, since it uses as much as digits as its factorization.

64261745173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 846720, while the sum is 46.

The spelling of 64261745173 in words is "sixty-four billion, two hundred sixty-one million, seven hundred forty-five thousand, one hundred seventy-three".