164447966638091 has 2 divisors, whose sum is σ = 164447966638092. Its totient is φ = 164447966638090.

The previous prime is 164447966638051. The next prime is 164447966638121. The reversal of 164447966638091 is 190836669744461.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 164447966638091 - 2¹⁸ = 164447966375947 is a prime.

It is not a weakly prime, because it can be changed into another prime (164447966638051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82223983319045 + 82223983319046.

It is an arithmetic number, because the mean of its divisors is an integer number (82223983319046).

Almost surely, 2^{164447966638091} is an apocalyptic number.

164447966638091 is a deficient number, since it is larger than the sum of its proper divisors (1).

164447966638091 is an equidigital number, since it uses as much as digits as its factorization.

164447966638091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1128701952, while the sum is 74.

The spelling of 164447966638091 in words is "one hundred sixty-four trillion, four hundred forty-seven billion, nine hundred sixty-six million, six hundred thirty-eight thousand, ninety-one".