164564985 has 32 divisors (see below), whose sum is σ = 298488960. Its totient is φ = 76750848.

The previous prime is 164564969. The next prime is 164565029. The reversal of 164564985 is 589465461.

It is not a de Polignac number, because 164564985 - 2⁴ = 164564969 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, 18504 + ... + 25913.

It is an arithmetic number, because the mean of its divisors is an integer number (9327780).

Almost surely, 2^164564985 is an apocalyptic number.

164564985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

164564985 is a deficient number, since it is larger than the sum of its proper divisors (133923975).

164564985 is a wasteful number, since it uses less digits than its factorization.

164564985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44457.

The product of its digits is 1036800, while the sum is 48.

The square root of 164564985 is about 12828.2884672898. The cubic root of 164564985 is about 547.9982162462.

The spelling of 164564985 in words is "one hundred sixty-four million, five hundred sixty-four thousand, nine hundred eighty-five".