164879865 has 24 divisors (see below), whose sum is σ = 286091520. Its totient is φ = 87843744.

The previous prime is 164879851. The next prime is 164879903. The reversal of 164879865 is 568978461.

164879865 is a `hidden beast` number, since 16 + 487 + 98 + 65 = 666.

It is not a de Polignac number, because 164879865 - 2⁵ = 164879833 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78114 + ... + 80196.

It is an arithmetic number, because the mean of its divisors is an integer number (11920480).

Almost surely, 2^164879865 is an apocalyptic number.

164879865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

164879865 is a deficient number, since it is larger than the sum of its proper divisors (121211655).

164879865 is a wasteful number, since it uses less digits than its factorization.

164879865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3853 (or 3850 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 164879865 is about 12840.5554786388. Note that the first 3 decimals coincide. The cubic root of 164879865 is about 548.3475083307.

The spelling of 164879865 in words is "one hundred sixty-four million, eight hundred seventy-nine thousand, eight hundred sixty-five".