164221825717 has 16 divisors (see below), whose sum is σ = 173443248000. Its totient is φ = 155177028864.

The previous prime is 164221825711. The next prime is 164221825721. The reversal of 164221825717 is 717528122461.

It is a cyclic number.

It is not a de Polignac number, because 164221825717 - 2²⁷ = 164087607989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164221825711) 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, 2275534 + ... + 2346592.

It is an arithmetic number, because the mean of its divisors is an integer number (10840203000).

Almost surely, 2^164221825717 is an apocalyptic number.

It is an amenable number.

164221825717 is a deficient number, since it is larger than the sum of its proper divisors (9221422283).

164221825717 is a wasteful number, since it uses less digits than its factorization.

164221825717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72300.

The product of its digits is 376320, while the sum is 46.

The spelling of 164221825717 in words is "one hundred sixty-four billion, two hundred twenty-one million, eight hundred twenty-five thousand, seven hundred seventeen".