165722195491 has 2 divisors, whose sum is σ = 165722195492. Its totient is φ = 165722195490.

The previous prime is 165722195477. The next prime is 165722195503. The reversal of 165722195491 is 194591227561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165722195491 - 2⁷ = 165722195363 is a prime.

It is not a weakly prime, because it can be changed into another prime (165722195591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82861097745 + 82861097746.

It is an arithmetic number, because the mean of its divisors is an integer number (82861097746).

Almost surely, 2^165722195491 is an apocalyptic number.

165722195491 is a deficient number, since it is larger than the sum of its proper divisors (1).

165722195491 is an equidigital number, since it uses as much as digits as its factorization.

165722195491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1360800, while the sum is 52.

The spelling of 165722195491 in words is "one hundred sixty-five billion, seven hundred twenty-two million, one hundred ninety-five thousand, four hundred ninety-one".