165481793 has 2 divisors, whose sum is σ = 165481794. Its totient is φ = 165481792.

The previous prime is 165481787. The next prime is 165481807. The reversal of 165481793 is 397184561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87459904 + 78021889 = 9352^2 + 8833^2 .

It is a cyclic number.

It is not a de Polignac number, because 165481793 - 2⁴ = 165481777 is a prime.

It is not a weakly prime, because it can be changed into another prime (165481753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82740896 + 82740897.

It is an arithmetic number, because the mean of its divisors is an integer number (82740897).

Almost surely, 2^165481793 is an apocalyptic number.

It is an amenable number.

165481793 is a deficient number, since it is larger than the sum of its proper divisors (1).

165481793 is an equidigital number, since it uses as much as digits as its factorization.

165481793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 44.

The square root of 165481793 is about 12863.9726756551. The cubic root of 165481793 is about 549.0139832294.

The spelling of 165481793 in words is "one hundred sixty-five million, four hundred eighty-one thousand, seven hundred ninety-three".