164217440791 has 2 divisors, whose sum is σ = 164217440792. Its totient is φ = 164217440790.

The previous prime is 164217440749. The next prime is 164217440851. The reversal of 164217440791 is 197044712461.

164217440791 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 164217440791 - 2¹⁹ = 164216916503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164217440711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82108720395 + 82108720396.

It is an arithmetic number, because the mean of its divisors is an integer number (82108720396).

Almost surely, 2^164217440791 is an apocalyptic number.

164217440791 is a deficient number, since it is larger than the sum of its proper divisors (1).

164217440791 is an equidigital number, since it uses as much as digits as its factorization.

164217440791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 338688, while the sum is 46.

The spelling of 164217440791 in words is "one hundred sixty-four billion, two hundred seventeen million, four hundred forty thousand, seven hundred ninety-one".