65613647 has 4 divisors (see below), whose sum is σ = 71578536. Its totient is φ = 59648760.

The previous prime is 65613643. The next prime is 65613677. The reversal of 65613647 is 74631656.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65613647 - 2² = 65613643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65613647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65613643) 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 3 ways as a sum of consecutive naturals, for example, 2982428 + ... + 2982449.

It is an arithmetic number, because the mean of its divisors is an integer number (17894634).

Almost surely, 2^65613647 is an apocalyptic number.

65613647 is a deficient number, since it is larger than the sum of its proper divisors (5964889).

65613647 is a wasteful number, since it uses less digits than its factorization.

65613647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5964888.

The product of its digits is 90720, while the sum is 38.

The square root of 65613647 is about 8100.2251203284. The cubic root of 65613647 is about 403.3339001578. Note that the first 3 decimals are identical.

Subtracting 65613647 from its reverse (74631656), we obtain a square (9018009 = 3003²).

The spelling of 65613647 in words is "sixty-five million, six hundred thirteen thousand, six hundred forty-seven".