164419393321 has 4 divisors (see below), whose sum is σ = 164420205012. Its totient is φ = 164418581632.

The previous prime is 164419393291. The next prime is 164419393343. The reversal of 164419393321 is 123393914461.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 75880415296 + 88538978025 = 275464^2 + 297555^2 .

It is a cyclic number.

It is not a de Polignac number, because 164419393321 - 2¹⁹ = 164418869033 is a prime.

It is a super-3 number, since 3×164419393321³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164419396321) 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, 177345 + ... + 600241.

It is an arithmetic number, because the mean of its divisors is an integer number (41105051253).

Almost surely, 2^164419393321 is an apocalyptic number.

It is an amenable number.

164419393321 is a deficient number, since it is larger than the sum of its proper divisors (811691).

164419393321 is an equidigital number, since it uses as much as digits as its factorization.

164419393321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811690.

The product of its digits is 419904, while the sum is 46.

The spelling of 164419393321 in words is "one hundred sixty-four billion, four hundred nineteen million, three hundred ninety-three thousand, three hundred twenty-one".