64645563 has 8 divisors (see below), whose sum is σ = 86231376. Its totient is φ = 43078400.

The previous prime is 64645517. The next prime is 64645573. The reversal of 64645563 is 36554646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64645563 - 2⁶ = 64645499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64645513) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 10183 + ... + 15263.

It is an arithmetic number, because the mean of its divisors is an integer number (10778922).

Almost surely, 2^64645563 is an apocalyptic number.

64645563 is a deficient number, since it is larger than the sum of its proper divisors (21585813).

64645563 is a wasteful number, since it uses less digits than its factorization.

64645563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9325.

The product of its digits is 259200, while the sum is 39.

The square root of 64645563 is about 8040.2464514466. The cubic root of 64645563 is about 401.3404260442.

The spelling of 64645563 in words is "sixty-four million, six hundred forty-five thousand, five hundred sixty-three".