64659663 has 6 divisors (see below), whose sum is σ = 93397304. Its totient is φ = 43106436.

The previous prime is 64659631. The next prime is 64659671. The reversal of 64659663 is 36695646.

It is not a de Polignac number, because 64659663 - 2⁵ = 64659631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64659613) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3592195 + ... + 3592212.

Almost surely, 2^64659663 is an apocalyptic number.

64659663 is a deficient number, since it is larger than the sum of its proper divisors (28737641).

64659663 is a wasteful number, since it uses less digits than its factorization.

64659663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7184413 (or 7184410 counting only the distinct ones).

The product of its digits is 699840, while the sum is 45.

The square root of 64659663 is about 8041.1232424332. The cubic root of 64659663 is about 401.3696030332.

The spelling of 64659663 in words is "sixty-four million, six hundred fifty-nine thousand, six hundred sixty-three".