65491972430849 has 8 divisors (see below), whose sum is σ = 66696388587240. Its totient is φ = 64291774896000.

The previous prime is 65491972430839. The next prime is 65491972430887. The reversal of 65491972430849 is 94803427919456.

It can be written as a sum of positive squares in 4 ways, for example, as 527453587600 + 64964518843249 = 726260^2 + 8060057^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65491972430849 - 2³² = 65487677463553 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (65491972430839) 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 7 ways as a sum of consecutive naturals, for example, 1054624052 + ... + 1054686149.

It is an arithmetic number, because the mean of its divisors is an integer number (8337048573405).

It is a 1-persistent number, because it is pandigital, but 2⋅65491972430849 = 130983944861698 is not.

Almost surely, 2^{65491972430849} is an apocalyptic number.

It is an amenable number.

65491972430849 is a deficient number, since it is larger than the sum of its proper divisors (1204416156391).

65491972430849 is a wasteful number, since it uses less digits than its factorization.

65491972430849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2109310771.

The product of its (nonzero) digits is 470292480, while the sum is 71.

The spelling of 65491972430849 in words is "sixty-five trillion, four hundred ninety-one billion, nine hundred seventy-two million, four hundred thirty thousand, eight hundred forty-nine".