65225546721 has 12 divisors (see below), whose sum is σ = 94353852372. Its totient is φ = 43419463776.

The previous prime is 65225546689. The next prime is 65225546759. The reversal of 65225546721 is 12764552256.

65225546721 is a `hidden beast` number, since 6 + 5 + 22 + 554 + 6 + 72 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 63637125696 + 1588421025 = 252264^2 + 39855^2 .

It is not a de Polignac number, because 65225546721 - 2⁵ = 65225546689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65225546761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5346406 + ... + 5358591.

It is an arithmetic number, because the mean of its divisors is an integer number (7862821031).

Almost surely, 2^65225546721 is an apocalyptic number.

It is an amenable number.

65225546721 is a deficient number, since it is larger than the sum of its proper divisors (29128305651).

65225546721 is a wasteful number, since it uses less digits than its factorization.

65225546721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10705680 (or 10705677 counting only the distinct ones).

The product of its digits is 1008000, while the sum is 45.

The spelling of 65225546721 in words is "sixty-five billion, two hundred twenty-five million, five hundred forty-six thousand, seven hundred twenty-one".