65613663 has 12 divisors (see below), whose sum is σ = 94968120. Its totient is φ = 43653456.

The previous prime is 65613643. The next prime is 65613677. The reversal of 65613663 is 36631656.

It is a happy number.

65613663 is a `hidden beast` number, since 6 + 561 + 36 + 63 = 666.

It is not a de Polignac number, because 65613663 - 2⁶ = 65613599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65613623) 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, 2581 + ... + 11742.

It is an arithmetic number, because the mean of its divisors is an integer number (7914010).

Almost surely, 2^65613663 is an apocalyptic number.

65613663 is a deficient number, since it is larger than the sum of its proper divisors (29354457).

65613663 is a wasteful number, since it uses less digits than its factorization.

65613663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14838 (or 14835 counting only the distinct ones).

The product of its digits is 58320, while the sum is 36.

The square root of 65613663 is about 8100.2261079553. The cubic root of 65613663 is about 403.3339329424. Note that the first 3 decimals are identical.

The spelling of 65613663 in words is "sixty-five million, six hundred thirteen thousand, six hundred sixty-three".