65540005 has 4 divisors (see below), whose sum is σ = 78648012. Its totient is φ = 52432000.

The previous prime is 65539993. The next prime is 65540023. The reversal of 65540005 is 50004556.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13786369 + 51753636 = 3713^2 + 7194^2 .

It is not a de Polignac number, because 65540005 - 2¹¹ = 65537957 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6553996 + ... + 6554005.

It is an arithmetic number, because the mean of its divisors is an integer number (19662003).

Almost surely, 2^65540005 is an apocalyptic number.

It is an amenable number.

65540005 is a deficient number, since it is larger than the sum of its proper divisors (13108007).

65540005 is a wasteful number, since it uses less digits than its factorization.

65540005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13108006.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 65540005 is about 8095.6781680104. The cubic root of 65540005 is about 403.1829486633.

The spelling of 65540005 in words is "sixty-five million, five hundred forty thousand, five".