164551385 has 16 divisors (see below), whose sum is σ = 199962000. Its totient is φ = 129985536.

The previous prime is 164551369. The next prime is 164551399. The reversal of 164551385 is 583155461.

It can be written as a sum of positive squares in 8 ways, for example, as 33860761 + 130690624 = 5819^2 + 11432^2 .

It is a cyclic number.

It is not a de Polignac number, because 164551385 - 2⁴ = 164551369 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156341 + ... + 157389.

It is an arithmetic number, because the mean of its divisors is an integer number (12497625).

Almost surely, 2^164551385 is an apocalyptic number.

It is an amenable number.

164551385 is a deficient number, since it is larger than the sum of its proper divisors (35410615).

164551385 is a wasteful number, since it uses less digits than its factorization.

164551385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1420.

The product of its digits is 72000, while the sum is 38.

The square root of 164551385 is about 12827.7583778305. The cubic root of 164551385 is about 547.9831199180.

The spelling of 164551385 in words is "one hundred sixty-four million, five hundred fifty-one thousand, three hundred eighty-five".