65521654241 has 4 divisors (see below), whose sum is σ = 65522242500. Its totient is φ = 65521065984.

The previous prime is 65521654213. The next prime is 65521654249. The reversal of 65521654241 is 14245612556.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 27835585600 + 37686068641 = 166840^2 + 194129^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65521654241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65521654249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70256 + ... + 368753.

It is an arithmetic number, because the mean of its divisors is an integer number (16380560625).

Almost surely, 2^65521654241 is an apocalyptic number.

It is an amenable number.

65521654241 is a deficient number, since it is larger than the sum of its proper divisors (588259).

65521654241 is a wasteful number, since it uses less digits than its factorization.

65521654241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588258.

The product of its digits is 288000, while the sum is 41.

The spelling of 65521654241 in words is "sixty-five billion, five hundred twenty-one million, six hundred fifty-four thousand, two hundred forty-one".