65961161641 has 4 divisors (see below), whose sum is σ = 66151251792. Its totient is φ = 65771071492.

The previous prime is 65961161569. The next prime is 65961161647. The reversal of 65961161641 is 14616116956.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65961161641 - 2⁹ = 65961161129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65961161591 and 65961161600.

It is not an unprimeable number, because it can be changed into a prime (65961161647) 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 3 ways as a sum of consecutive naturals, for example, 95044555 + ... + 95045248.

It is an arithmetic number, because the mean of its divisors is an integer number (16537812948).

Almost surely, 2^65961161641 is an apocalyptic number.

It is an amenable number.

65961161641 is a deficient number, since it is larger than the sum of its proper divisors (190090151).

65961161641 is a wasteful number, since it uses less digits than its factorization.

65961161641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190090150.

The product of its digits is 233280, while the sum is 46.

The spelling of 65961161641 in words is "sixty-five billion, nine hundred sixty-one million, one hundred sixty-one thousand, six hundred forty-one".