164421042565 has 16 divisors (see below), whose sum is σ = 212507140608. Its totient is φ = 121404580416.

The previous prime is 164421042523. The next prime is 164421042587. The reversal of 164421042565 is 565240124461.

It is a cyclic number.

It is not a de Polignac number, because 164421042565 - 2²¹ = 164418945413 is a prime.

It is a super-3 number, since 3×164421042565³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 438252 + ... + 721738.

It is an arithmetic number, because the mean of its divisors is an integer number (13281696288).

Almost surely, 2^164421042565 is an apocalyptic number.

It is an amenable number.

164421042565 is a deficient number, since it is larger than the sum of its proper divisors (48086098043).

164421042565 is a wasteful number, since it uses less digits than its factorization.

164421042565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292428.

The product of its (nonzero) digits is 230400, while the sum is 40.

The spelling of 164421042565 in words is "one hundred sixty-four billion, four hundred twenty-one million, forty-two thousand, five hundred sixty-five".