65942238161 has 4 divisors (see below), whose sum is σ = 67724460852. Its totient is φ = 64160015472.

The previous prime is 65942238157. The next prime is 65942238203. The reversal of 65942238161 is 16183224956.

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 60052443136 + 5889795025 = 245056^2 + 76745^2 .

It is a cyclic number.

It is not a de Polignac number, because 65942238161 - 2² = 65942238157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65942234161) 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, 891111290 + ... + 891111363.

It is an arithmetic number, because the mean of its divisors is an integer number (16931115213).

Almost surely, 2^65942238161 is an apocalyptic number.

It is an amenable number.

65942238161 is a deficient number, since it is larger than the sum of its proper divisors (1782222691).

65942238161 is a wasteful number, since it uses less digits than its factorization.

65942238161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1782222690.

The product of its digits is 622080, while the sum is 47.

The spelling of 65942238161 in words is "sixty-five billion, nine hundred forty-two million, two hundred thirty-eight thousand, one hundred sixty-one".