65850561 has 72 divisors (see below), whose sum is σ = 120931200. Its totient is φ = 34292160.

The previous prime is 65850527. The next prime is 65850563. The reversal of 65850561 is 16505856.

It is not a de Polignac number, because 65850561 - 2¹¹ = 65848513 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (65850563) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 242856 + ... + 243126.

It is an arithmetic number, because the mean of its divisors is an integer number (1679600).

Almost surely, 2^65850561 is an apocalyptic number.

It is an amenable number.

65850561 is a deficient number, since it is larger than the sum of its proper divisors (55080639).

65850561 is a wasteful number, since it uses less digits than its factorization.

65850561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339 (or 329 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The square root of 65850561 is about 8114.8358578594. The cubic root of 65850561 is about 403.8187620396.

The spelling of 65850561 in words is "sixty-five million, eight hundred fifty thousand, five hundred sixty-one".