164260725221 has 8 divisors (see below), whose sum is σ = 164867180544. Its totient is φ = 163654425760.

The previous prime is 164260725197. The next prime is 164260725301. The reversal of 164260725221 is 122527062461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164260725221 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 (164260728221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2339006 + ... + 2408208.

It is an arithmetic number, because the mean of its divisors is an integer number (20608397568).

Almost surely, 2^164260725221 is an apocalyptic number.

It is an amenable number.

164260725221 is a deficient number, since it is larger than the sum of its proper divisors (606455323).

164260725221 is an equidigital number, since it uses as much as digits as its factorization.

164260725221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77931.

The product of its (nonzero) digits is 80640, while the sum is 38.

Adding to 164260725221 its reverse (122527062461), we get a palindrome (286787787682).

The spelling of 164260725221 in words is "one hundred sixty-four billion, two hundred sixty million, seven hundred twenty-five thousand, two hundred twenty-one".