320144334551 has 4 divisors (see below), whose sum is σ = 320344802232. Its totient is φ = 319943866872.

The previous prime is 320144334547. The next prime is 320144334557. The reversal of 320144334551 is 155433441023.

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

It is a cyclic number.

It is not a de Polignac number, because 320144334551 - 2² = 320144334547 is a prime.

It is a super-2 number, since 2×320144334551² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320144334557) 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, 100231445 + ... + 100234638.

It is an arithmetic number, because the mean of its divisors is an integer number (80086200558).

Almost surely, 2^320144334551 is an apocalyptic number.

320144334551 is a deficient number, since it is larger than the sum of its proper divisors (200467681).

320144334551 is a wasteful number, since it uses less digits than its factorization.

320144334551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200467680.

The product of its (nonzero) digits is 86400, while the sum is 35.

Adding to 320144334551 its reverse (155433441023), we get a palindrome (475577775574).

The spelling of 320144334551 in words is "three hundred twenty billion, one hundred forty-four million, three hundred thirty-four thousand, five hundred fifty-one".