164385239805 has 80 divisors (see below), whose sum is σ = 306543916800. Its totient is φ = 84174975360.

The previous prime is 164385239789. The next prime is 164385239827. The reversal of 164385239805 is 508932583461.

164385239805 is a `hidden beast` number, since 1 + 6 + 4 + 38 + 523 + 9 + 80 + 5 = 666.

It is not a de Polignac number, because 164385239805 - 2⁴ = 164385239789 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2063260 + ... + 2141450.

It is an arithmetic number, because the mean of its divisors is an integer number (3831798960).

Almost surely, 2^164385239805 is an apocalyptic number.

164385239805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

164385239805 is a deficient number, since it is larger than the sum of its proper divisors (142158676995).

164385239805 is a wasteful number, since it uses less digits than its factorization.

164385239805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78416 (or 78407 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 54.

The spelling of 164385239805 in words is "one hundred sixty-four billion, three hundred eighty-five million, two hundred thirty-nine thousand, eight hundred five".