164644784385 has 32 divisors (see below), whose sum is σ = 264950700672. Its totient is φ = 87305057280.

The previous prime is 164644784357. The next prime is 164644784399. The reversal of 164644784385 is 583487446461.

It is not a de Polignac number, because 164644784385 - 2⁹ = 164644783873 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3129417 + ... + 3181593.

It is an arithmetic number, because the mean of its divisors is an integer number (8279709396).

Almost surely, 2^164644784385 is an apocalyptic number.

164644784385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

164644784385 is a deficient number, since it is larger than the sum of its proper divisors (100305916287).

164644784385 is a wasteful number, since it uses less digits than its factorization.

164644784385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53393.

The product of its digits is 61931520, while the sum is 60.

The spelling of 164644784385 in words is "one hundred sixty-four billion, six hundred forty-four million, seven hundred eighty-four thousand, three hundred eighty-five".