65671636241 has 4 divisors (see below), whose sum is σ = 65674389684. Its totient is φ = 65668882800.

The previous prime is 65671636237. The next prime is 65671636267. The reversal of 65671636241 is 14263617656.

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 58990208641 + 6681427600 = 242879^2 + 81740^2 .

It is a cyclic number.

It is not a de Polignac number, because 65671636241 - 2² = 65671636237 is a prime.

It is a super-2 number, since 2×65671636241² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65671636201) 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, 1340630 + ... + 1388751.

It is an arithmetic number, because the mean of its divisors is an integer number (16418597421).

Almost surely, 2^65671636241 is an apocalyptic number.

It is an amenable number.

65671636241 is a deficient number, since it is larger than the sum of its proper divisors (2753443).

65671636241 is a wasteful number, since it uses less digits than its factorization.

65671636241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2753442.

The product of its digits is 1088640, while the sum is 47.

The spelling of 65671636241 in words is "sixty-five billion, six hundred seventy-one million, six hundred thirty-six thousand, two hundred forty-one".