65406065 has 4 divisors (see below), whose sum is σ = 78487284. Its totient is φ = 52324848.

The previous prime is 65406031. The next prime is 65406067. The reversal of 65406065 is 56060456.

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 10394176 + 55011889 = 3224^2 + 7417^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65406065 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65406067) 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, 6540602 + ... + 6540611.

It is an arithmetic number, because the mean of its divisors is an integer number (19621821).

Almost surely, 2^65406065 is an apocalyptic number.

It is an amenable number.

65406065 is a deficient number, since it is larger than the sum of its proper divisors (13081219).

65406065 is a wasteful number, since it uses less digits than its factorization.

65406065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13081218.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 65406065 is about 8087.4016222765. The cubic root of 65406065 is about 402.9081081135.

The spelling of 65406065 in words is "sixty-five million, four hundred six thousand, sixty-five".