164665540865 has 16 divisors (see below), whose sum is σ = 228685601280. Its totient is φ = 111484226880.

The previous prime is 164665540861. The next prime is 164665540867. The reversal of 164665540865 is 568045566461.

It is not a de Polignac number, because 164665540865 - 2² = 164665540861 is a prime.

It is a super-2 number, since 2×164665540865² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 164665540865.

It is not an unprimeable number, because it can be changed into a prime (164665540861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29774006 + ... + 29779535.

It is an arithmetic number, because the mean of its divisors is an integer number (14292850080).

Almost surely, 2^164665540865 is an apocalyptic number.

It is an amenable number.

164665540865 is a deficient number, since it is larger than the sum of its proper divisors (64020060415).

164665540865 is an equidigital number, since it uses as much as digits as its factorization.

164665540865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59553632.

The product of its (nonzero) digits is 20736000, while the sum is 56.

The spelling of 164665540865 in words is "one hundred sixty-four billion, six hundred sixty-five million, five hundred forty thousand, eight hundred sixty-five".