164816865 has 12 divisors (see below), whose sum is σ = 285682644. Its totient is φ = 87902304.

The previous prime is 164816837. The next prime is 164816879. The reversal of 164816865 is 568618461.

It can be written as a sum of positive squares in 2 ways, for example, as 68757264 + 96059601 = 8292^2 + 9801^2 .

It is not a de Polignac number, because 164816865 - 2⁷ = 164816737 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 3662597 = 164816865 / (1 + 6 + 4 + 8 + 1 + 6 + 8 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 164816865.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1831254 + ... + 1831343.

It is an arithmetic number, because the mean of its divisors is an integer number (23806887).

Almost surely, 2^164816865 is an apocalyptic number.

164816865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

164816865 is a deficient number, since it is larger than the sum of its proper divisors (120865779).

164816865 is a wasteful number, since it uses less digits than its factorization.

164816865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3662608 (or 3662605 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 164816865 is about 12838.1020793574. The cubic root of 164816865 is about 548.2776589004.

The spelling of 164816865 in words is "one hundred sixty-four million, eight hundred sixteen thousand, eight hundred sixty-five".