165806051 has 2 divisors, whose sum is σ = 165806052. Its totient is φ = 165806050.

The previous prime is 165806041. The next prime is 165806059. The reversal of 165806051 is 150608561.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (150608561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165806051 - 2¹⁰ = 165805027 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165805999 and 165806017.

It is not a weakly prime, because it can be changed into another prime (165806059) 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, 82903025 + 82903026.

It is an arithmetic number, because the mean of its divisors is an integer number (82903026).

Almost surely, 2^165806051 is an apocalyptic number.

165806051 is a deficient number, since it is larger than the sum of its proper divisors (1).

165806051 is an equidigital number, since it uses as much as digits as its factorization.

165806051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 165806051 is about 12876.5698460421. The cubic root of 165806051 is about 549.3723429468.

The spelling of 165806051 in words is "one hundred sixty-five million, eight hundred six thousand, fifty-one".