163909845 has 64 divisors (see below), whose sum is σ = 331776000. Its totient is φ = 76000320.

The previous prime is 163909831. The next prime is 163909859. The reversal of 163909845 is 548909361.

It is a happy number.

163909845 is a `hidden beast` number, since 1 + 639 + 0 + 9 + 8 + 4 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (163909831) and next prime (163909859).

It is not a de Polignac number, because 163909845 - 2⁵ = 163909813 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 163909845.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 31756 + ... + 36554.

It is an arithmetic number, because the mean of its divisors is an integer number (5184000).

Almost surely, 2^163909845 is an apocalyptic number.

163909845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

163909845 is an abundant number, since it is smaller than the sum of its proper divisors (167866155).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

163909845 is a wasteful number, since it uses less digits than its factorization.

163909845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4847 (or 4841 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 163909845 is about 12802.7280296037. The cubic root of 163909845 is about 547.2700479252.

The spelling of 163909845 in words is "one hundred sixty-three million, nine hundred nine thousand, eight hundred forty-five".