165910947 has 4 divisors (see below), whose sum is σ = 221214600. Its totient is φ = 110607296.

The previous prime is 165910931. The next prime is 165910949. The reversal of 165910947 is 749019561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165910947 - 2⁴ = 165910931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165910899 and 165910908.

It is not an unprimeable number, because it can be changed into a prime (165910949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27651822 + ... + 27651827.

It is an arithmetic number, because the mean of its divisors is an integer number (55303650).

Almost surely, 2^165910947 is an apocalyptic number.

165910947 is a deficient number, since it is larger than the sum of its proper divisors (55303653).

165910947 is an equidigital number, since it uses as much as digits as its factorization.

165910947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55303652.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 165910947 is about 12880.6423364675. The cubic root of 165910947 is about 549.4881706720.

The spelling of 165910947 in words is "one hundred sixty-five million, nine hundred ten thousand, nine hundred forty-seven".