165863907 has 12 divisors (see below), whose sum is σ = 261361464. Its totient is φ = 100523520.

The previous prime is 165863891. The next prime is 165863909. The reversal of 165863907 is 709368561.

It is a happy number.

165863907 is a `hidden beast` number, since 1 + 6 + 5 + 8 + 639 + 0 + 7 = 666.

It is not a de Polignac number, because 165863907 - 2⁴ = 165863891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165863909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 837598 + ... + 837795.

It is an arithmetic number, because the mean of its divisors is an integer number (21780122).

Almost surely, 2^165863907 is an apocalyptic number.

165863907 is a deficient number, since it is larger than the sum of its proper divisors (95497557).

165863907 is a wasteful number, since it uses less digits than its factorization.

165863907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1675410 (or 1675407 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 165863907 is about 12878.8162111275. The cubic root of 165863907 is about 549.4362344430.

The spelling of 165863907 in words is "one hundred sixty-five million, eight hundred sixty-three thousand, nine hundred seven".