65261006561 has 16 divisors (see below), whose sum is σ = 70311225600. Its totient is φ = 60373062288.

The previous prime is 65261006539. The next prime is 65261006693. The reversal of 65261006561 is 16560016256.

It is a cyclic number.

It is not a de Polignac number, because 65261006561 - 2⁶ = 65261006497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65261006501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4361030 + ... + 4375968.

It is an arithmetic number, because the mean of its divisors is an integer number (4394451600).

Almost surely, 2^65261006561 is an apocalyptic number.

It is an amenable number.

65261006561 is a deficient number, since it is larger than the sum of its proper divisors (5050219039).

65261006561 is a wasteful number, since it uses less digits than its factorization.

65261006561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20348.

The product of its (nonzero) digits is 64800, while the sum is 38.

The spelling of 65261006561 in words is "sixty-five billion, two hundred sixty-one million, six thousand, five hundred sixty-one".