164096165621 has 2 divisors, whose sum is σ = 164096165622. Its totient is φ = 164096165620.

The previous prime is 164096165609. The next prime is 164096165663. The reversal of 164096165621 is 126561690461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103803818596 + 60292347025 = 322186^2 + 245545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164096165621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164096165521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82048082810 + 82048082811.

It is an arithmetic number, because the mean of its divisors is an integer number (82048082811).

Almost surely, 2^164096165621 is an apocalyptic number.

It is an amenable number.

164096165621 is a deficient number, since it is larger than the sum of its proper divisors (1).

164096165621 is an equidigital number, since it uses as much as digits as its factorization.

164096165621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 47.

The spelling of 164096165621 in words is "one hundred sixty-four billion, ninety-six million, one hundred sixty-five thousand, six hundred twenty-one".