65561447 has 8 divisors (see below), whose sum is σ = 76952736. Its totient is φ = 54676512.

The previous prime is 65561413. The next prime is 65561453. The reversal of 65561447 is 74416556.

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 65561447 - 2⁶ = 65561383 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65561447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65561407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126308 + ... + 126825.

It is an arithmetic number, because the mean of its divisors is an integer number (9619092).

Almost surely, 2^65561447 is an apocalyptic number.

65561447 is a deficient number, since it is larger than the sum of its proper divisors (11391289).

65561447 is a wasteful number, since it uses less digits than its factorization.

65561447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253177.

The product of its digits is 100800, while the sum is 38.

The square root of 65561447 is about 8097.0023465478. The cubic root of 65561447 is about 403.2269121743.

Subtracting from 65561447 its sum of digits (38), we obtain a square (65561409 = 8097²).

The spelling of 65561447 in words is "sixty-five million, five hundred sixty-one thousand, four hundred forty-seven".