163856673 has 6 divisors (see below), whose sum is σ = 236681874. Its totient is φ = 109237776.

The previous prime is 163856653. The next prime is 163856677. The reversal of 163856673 is 376658361.

163856673 is a `hidden beast` number, since 1 + 638 + 5 + 6 + 6 + 7 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 163405089 + 451584 = 12783^2 + 672^2 .

It is not a de Polignac number, because 163856673 - 2¹⁴ = 163840289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (163856677) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9103140 + ... + 9103157.

It is an arithmetic number, because the mean of its divisors is an integer number (39446979).

Almost surely, 2^163856673 is an apocalyptic number.

It is an amenable number.

163856673 is a deficient number, since it is larger than the sum of its proper divisors (72825201).

163856673 is a wasteful number, since it uses less digits than its factorization.

163856673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18206303 (or 18206300 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The square root of 163856673 is about 12800.6512724939. The cubic root of 163856673 is about 547.2108637841.

It can be divided in two parts, 1638 and 56673, that added together give a triangular number (58311 = T₃₄₁).

The spelling of 163856673 in words is "one hundred sixty-three million, eight hundred fifty-six thousand, six hundred seventy-three".