65856013 has 4 divisors (see below), whose sum is σ = 68126940. Its totient is φ = 63585088.

The previous prime is 65855987. The next prime is 65856017. The reversal of 65856013 is 31065856.

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 40424164 + 25431849 = 6358^2 + 5043^2 .

It is a cyclic number.

It is not a de Polignac number, because 65856013 - 2²¹ = 63758861 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 65856013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65856017) 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, 1135420 + ... + 1135477.

It is an arithmetic number, because the mean of its divisors is an integer number (17031735).

Almost surely, 2^65856013 is an apocalyptic number.

It is an amenable number.

65856013 is a deficient number, since it is larger than the sum of its proper divisors (2270927).

65856013 is a wasteful number, since it uses less digits than its factorization.

65856013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270926.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 65856013 is about 8115.1717788350. The cubic root of 65856013 is about 403.8299062581.

The spelling of 65856013 in words is "sixty-five million, eight hundred fifty-six thousand, thirteen".