164216381 has 8 divisors (see below), whose sum is σ = 187761600. Its totient is φ = 140692608.

The previous prime is 164216369. The next prime is 164216383. The reversal of 164216381 is 183612461.

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

It is not a de Polignac number, because 164216381 - 2¹⁸ = 163954237 is a prime.

It is a super-2 number, since 2×164216381² = 53934039577474322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164216383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17645 + ... + 25293.

It is an arithmetic number, because the mean of its divisors is an integer number (23470200).

Almost surely, 2^164216381 is an apocalyptic number.

It is an amenable number.

164216381 is a deficient number, since it is larger than the sum of its proper divisors (23545219).

164216381 is an equidigital number, since it uses as much as digits as its factorization.

164216381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10723.

The product of its digits is 6912, while the sum is 32.

The square root of 164216381 is about 12814.6939487449. The cubic root of 164216381 is about 547.6109945035.

The spelling of 164216381 in words is "one hundred sixty-four million, two hundred sixteen thousand, three hundred eighty-one".