64645573 has 2 divisors, whose sum is σ = 64645574. Its totient is φ = 64645572.

The previous prime is 64645517. The next prime is 64645579. The reversal of 64645573 is 37554646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46267204 + 18378369 = 6802^2 + 4287^2 .

It is a cyclic number.

It is not a de Polignac number, because 64645573 - 2²⁵ = 31091141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64645579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32322786 + 32322787.

It is an arithmetic number, because the mean of its divisors is an integer number (32322787).

Almost surely, 2^64645573 is an apocalyptic number.

It is an amenable number.

64645573 is a deficient number, since it is larger than the sum of its proper divisors (1).

64645573 is an equidigital number, since it uses as much as digits as its factorization.

64645573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 40.

The square root of 64645573 is about 8040.2470733181. The cubic root of 64645573 is about 401.3404467386.

The spelling of 64645573 in words is "sixty-four million, six hundred forty-five thousand, five hundred seventy-three".