65073551221 has 16 divisors (see below), whose sum is σ = 75987431424. Its totient is φ = 54565190064.

The previous prime is 65073551197. The next prime is 65073551227. The reversal of 65073551221 is 12215537056.

It is not a de Polignac number, because 65073551221 - 2²¹ = 65071454069 is a prime.

It is a super-2 number, since 2×65073551221² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65073551227) 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, 679896 + ... + 769678.

It is an arithmetic number, because the mean of its divisors is an integer number (4749214464).

Almost surely, 2^65073551221 is an apocalyptic number.

It is an amenable number.

65073551221 is a deficient number, since it is larger than the sum of its proper divisors (10913880203).

65073551221 is a wasteful number, since it uses less digits than its factorization.

65073551221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92040.

The product of its (nonzero) digits is 63000, while the sum is 37.

The spelling of 65073551221 in words is "sixty-five billion, seventy-three million, five hundred fifty-one thousand, two hundred twenty-one".