65983561 has 16 divisors (see below), whose sum is σ = 79638400. Its totient is φ = 53405568.

The previous prime is 65983559. The next prime is 65983591. The reversal of 65983561 is 16538956.

It is a cyclic number.

It is not a de Polignac number, because 65983561 - 2¹ = 65983559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65983501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53791 + ... + 55003.

It is an arithmetic number, because the mean of its divisors is an integer number (4977400).

Almost surely, 2^65983561 is an apocalyptic number.

It is an amenable number.

65983561 is a deficient number, since it is larger than the sum of its proper divisors (13654839).

65983561 is a wasteful number, since it uses less digits than its factorization.

65983561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1648.

The product of its digits is 194400, while the sum is 43.

The square root of 65983561 is about 8123.0265911174. The cubic root of 65983561 is about 404.0904467788.

The spelling of 65983561 in words is "sixty-five million, nine hundred eighty-three thousand, five hundred sixty-one".