65571049741 has 4 divisors (see below), whose sum is σ = 69428170332. Its totient is φ = 61713929152.

The previous prime is 65571049723. The next prime is 65571049771. The reversal of 65571049741 is 14794017556.

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 30986208841 + 34584840900 = 176029^2 + 185970^2 .

It is a cyclic number.

It is not a de Polignac number, because 65571049741 - 2³¹ = 63423566093 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65571049711) 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, 1928560270 + ... + 1928560303.

It is an arithmetic number, because the mean of its divisors is an integer number (17357042583).

Almost surely, 2^65571049741 is an apocalyptic number.

It is an amenable number.

65571049741 is a deficient number, since it is larger than the sum of its proper divisors (3857120591).

65571049741 is a wasteful number, since it uses less digits than its factorization.

65571049741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3857120590.

The product of its (nonzero) digits is 1058400, while the sum is 49.

The spelling of 65571049741 in words is "sixty-five billion, five hundred seventy-one million, forty-nine thousand, seven hundred forty-one".