64655217 has 12 divisors (see below), whose sum is σ = 101881104. Its totient is φ = 39184920.

The previous prime is 64655197. The next prime is 64655249. The reversal of 64655217 is 71255646.

It is a happy number.

64655217 is a `hidden beast` number, since 646 + 5 + 5 + 2 + 1 + 7 = 666.

It is not a de Polignac number, because 64655217 - 2⁶ = 64655153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64655287) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 326443 + ... + 326640.

It is an arithmetic number, because the mean of its divisors is an integer number (8490092).

Almost surely, 2^64655217 is an apocalyptic number.

It is an amenable number.

64655217 is a deficient number, since it is larger than the sum of its proper divisors (37225887).

64655217 is a wasteful number, since it uses less digits than its factorization.

64655217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653100 (or 653097 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 64655217 is about 8040.8467837660. The cubic root of 64655217 is about 401.3604034278.

The spelling of 64655217 in words is "sixty-four million, six hundred fifty-five thousand, two hundred seventeen".