164820865 has 32 divisors (see below), whose sum is σ = 229547520. Its totient is φ = 112281600.

The previous prime is 164820847. The next prime is 164820881. The reversal of 164820865 is 568028461.

It is not a de Polignac number, because 164820865 - 2¹⁵ = 164788097 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 382200 + ... + 382630.

It is an arithmetic number, because the mean of its divisors is an integer number (7173360).

Almost surely, 2^164820865 is an apocalyptic number.

It is an amenable number.

164820865 is a deficient number, since it is larger than the sum of its proper divisors (64726655).

164820865 is a wasteful number, since it uses less digits than its factorization.

164820865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873.

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 164820865 is about 12838.2578646793. The cubic root of 164820865 is about 548.2820943140.

The spelling of 164820865 in words is "one hundred sixty-four million, eight hundred twenty thousand, eight hundred sixty-five".