65540447 has 4 divisors (see below), whose sum is σ = 74903376. Its totient is φ = 56177520.

The previous prime is 65540429. The next prime is 65540473. The reversal of 65540447 is 74404556.

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

It is not a de Polignac number, because 65540447 - 2¹⁶ = 65474911 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 (65540407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4681454 + ... + 4681467.

It is an arithmetic number, because the mean of its divisors is an integer number (18725844).

Almost surely, 2^65540447 is an apocalyptic number.

65540447 is a deficient number, since it is larger than the sum of its proper divisors (9362929).

65540447 is an equidigital number, since it uses as much as digits as its factorization.

65540447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9362928.

The product of its (nonzero) digits is 67200, while the sum is 35.

The square root of 65540447 is about 8095.7054664804. The cubic root of 65540447 is about 403.1838550129.

The spelling of 65540447 in words is "sixty-five million, five hundred forty thousand, four hundred forty-seven".