164635665 has 32 divisors (see below), whose sum is σ = 282009600. Its totient is φ = 81766080.

The previous prime is 164635661. The next prime is 164635711. The reversal of 164635665 is 566536461.

It is not a de Polignac number, because 164635665 - 2² = 164635661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (164635661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11920 + ... + 21710.

It is an arithmetic number, because the mean of its divisors is an integer number (8812800).

Almost surely, 2^164635665 is an apocalyptic number.

164635665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

164635665 is a deficient number, since it is larger than the sum of its proper divisors (117373935).

164635665 is a wasteful number, since it uses less digits than its factorization.

164635665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9877.

The product of its digits is 388800, while the sum is 42.

The square root of 164635665 is about 12831.0430207369. The cubic root of 164635665 is about 548.0766593611.

The spelling of 164635665 in words is "one hundred sixty-four million, six hundred thirty-five thousand, six hundred sixty-five".