164868505 has 4 divisors (see below), whose sum is σ = 197842212. Its totient is φ = 131894800.

The previous prime is 164868443. The next prime is 164868523. The reversal of 164868505 is 505868461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 505868461 = 7 ⋅72266923.

It can be written as a sum of positive squares in 2 ways, for example, as 18627856 + 146240649 = 4316^2 + 12093^2 .

It is not a de Polignac number, because 164868505 - 2¹⁹ = 164344217 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16486846 + ... + 16486855.

It is an arithmetic number, because the mean of its divisors is an integer number (49460553).

Almost surely, 2^164868505 is an apocalyptic number.

It is an amenable number.

164868505 is a deficient number, since it is larger than the sum of its proper divisors (32973707).

164868505 is an equidigital number, since it uses as much as digits as its factorization.

164868505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32973706.

The product of its (nonzero) digits is 230400, while the sum is 43.

The square root of 164868505 is about 12840.1131225546. The cubic root of 164868505 is about 548.3349145739.

The spelling of 164868505 in words is "one hundred sixty-four million, eight hundred sixty-eight thousand, five hundred five".