320022321551 has 4 divisors (see below), whose sum is σ = 320035403400. Its totient is φ = 320009239704.

The previous prime is 320022321547. The next prime is 320022321569. The reversal of 320022321551 is 155123220023.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155123220023 = 10909 ⋅14219747.

It is a cyclic number.

It is not a de Polignac number, because 320022321551 - 2² = 320022321547 is a prime.

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 320022321551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320022321571) 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, 6504161 + ... + 6553178.

It is an arithmetic number, because the mean of its divisors is an integer number (80008850850).

Almost surely, 2^320022321551 is an apocalyptic number.

320022321551 is a deficient number, since it is larger than the sum of its proper divisors (13081849).

320022321551 is a wasteful number, since it uses less digits than its factorization.

320022321551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13081848.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 320022321551 its reverse (155123220023), we get a palindrome (475145541574).

The spelling of 320022321551 in words is "three hundred twenty billion, twenty-two million, three hundred twenty-one thousand, five hundred fifty-one".