320218413581 has 4 divisors (see below), whose sum is σ = 349329178464. Its totient is φ = 291107648700.

The previous prime is 320218413553. The next prime is 320218413617. The reversal of 320218413581 is 185314812023.

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 not a de Polignac number, because 320218413581 - 2¹⁴ = 320218397197 is a prime.

It is a super-2 number, since 2×320218413581² (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 (320218413521) 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, 14555382425 + ... + 14555382446.

It is an arithmetic number, because the mean of its divisors is an integer number (87332294616).

Almost surely, 2^320218413581 is an apocalyptic number.

It is an amenable number.

320218413581 is a deficient number, since it is larger than the sum of its proper divisors (29110764883).

320218413581 is a wasteful number, since it uses less digits than its factorization.

320218413581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29110764882.

The product of its (nonzero) digits is 46080, while the sum is 38.

The spelling of 320218413581 in words is "three hundred twenty billion, two hundred eighteen million, four hundred thirteen thousand, five hundred eighty-one".