164406405643 has 4 divisors (see below), whose sum is σ = 164407949568. Its totient is φ = 164404861720.

The previous prime is 164406405641. The next prime is 164406405649. The reversal of 164406405643 is 346504604461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346504604461 = 223 ⋅1553832307.

It is a cyclic number.

It is not a de Polignac number, because 164406405643 - 2¹ = 164406405641 is a prime.

It is a super-3 number, since 3×164406405643³ (a number of 35 digits) contains 333 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 164406405643.

It is not an unprimeable number, because it can be changed into a prime (164406405641) 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, 599371 + ... + 829492.

It is an arithmetic number, because the mean of its divisors is an integer number (41101987392).

Almost surely, 2^164406405643 is an apocalyptic number.

164406405643 is a deficient number, since it is larger than the sum of its proper divisors (1543925).

164406405643 is a wasteful number, since it uses less digits than its factorization.

164406405643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1543924.

The product of its (nonzero) digits is 829440, while the sum is 43.

The spelling of 164406405643 in words is "one hundred sixty-four billion, four hundred six million, four hundred five thousand, six hundred forty-three".