65657273641 has 4 divisors (see below), whose sum is σ = 65990559492. Its totient is φ = 65323987792.

The previous prime is 65657273621. The next prime is 65657273653. The reversal of 65657273641 is 14637275656.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 63910368025 + 1746905616 = 252805^2 + 41796^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65657273641 is a prime.

It is a super-3 number, since 3×65657273641³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65657273621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166642630 + ... + 166643023.

It is an arithmetic number, because the mean of its divisors is an integer number (16497639873).

Almost surely, 2^65657273641 is an apocalyptic number.

It is an amenable number.

65657273641 is a deficient number, since it is larger than the sum of its proper divisors (333285851).

65657273641 is a wasteful number, since it uses less digits than its factorization.

65657273641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333285850.

The product of its digits is 6350400, while the sum is 52.

The spelling of 65657273641 in words is "sixty-five billion, six hundred fifty-seven million, two hundred seventy-three thousand, six hundred forty-one".