65440161330231 has 4 divisors (see below), whose sum is σ = 87253548440312. Its totient is φ = 43626774220152.

The previous prime is 65440161330161. The next prime is 65440161330251. The reversal of 65440161330231 is 13203316104456.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 65440161330231 - 2¹⁷ = 65440161199159 is a prime.

It is a super-2 number, since 2×65440161330231² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65440161330231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65440161330251) 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, 10906693555036 + ... + 10906693555041.

It is an arithmetic number, because the mean of its divisors is an integer number (21813387110078).

Almost surely, 2^{65440161330231} is an apocalyptic number.

65440161330231 is a deficient number, since it is larger than the sum of its proper divisors (21813387110081).

65440161330231 is a wasteful number, since it uses less digits than its factorization.

65440161330231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21813387110080.

The product of its (nonzero) digits is 155520, while the sum is 39.

Adding to 65440161330231 its reverse (13203316104456), we get a palindrome (78643477434687).

The spelling of 65440161330231 in words is "sixty-five trillion, four hundred forty billion, one hundred sixty-one million, three hundred thirty thousand, two hundred thirty-one".