165916469 has 2 divisors, whose sum is σ = 165916470. Its totient is φ = 165916468.

The previous prime is 165916459. The next prime is 165916477. The reversal of 165916469 is 964619561.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145323025 + 20593444 = 12055^2 + 4538^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165916469 is a prime.

It is a super-2 number, since 2×165916469² = 55056549370855922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165916459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82958234 + 82958235.

It is an arithmetic number, because the mean of its divisors is an integer number (82958235).

Almost surely, 2^165916469 is an apocalyptic number.

It is an amenable number.

165916469 is a deficient number, since it is larger than the sum of its proper divisors (1).

165916469 is an equidigital number, since it uses as much as digits as its factorization.

165916469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 47.

The square root of 165916469 is about 12880.8566873481. The cubic root of 165916469 is about 549.4942667937.

The spelling of 165916469 in words is "one hundred sixty-five million, nine hundred sixteen thousand, four hundred sixty-nine".