165808947 has 16 divisors (see below), whose sum is σ = 224088480. Its totient is φ = 109043712.

The previous prime is 165808943. The next prime is 165808949. The reversal of 165808947 is 749808561.

It is not a de Polignac number, because 165808947 - 2² = 165808943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165808896 and 165808905.

It is not an unprimeable number, because it can be changed into a prime (165808943) 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 in 15 ways as a sum of consecutive naturals, for example, 83053 + ... + 85025.

It is an arithmetic number, because the mean of its divisors is an integer number (14005530).

Almost surely, 2^165808947 is an apocalyptic number.

165808947 is a deficient number, since it is larger than the sum of its proper divisors (58279533).

165808947 is a wasteful number, since it uses less digits than its factorization.

165808947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2342.

The product of its (nonzero) digits is 483840, while the sum is 48.

The square root of 165808947 is about 12876.6822978592. The cubic root of 165808947 is about 549.3755414087.

The spelling of 165808947 in words is "one hundred sixty-five million, eight hundred eight thousand, nine hundred forty-seven".