163953855 has 64 divisors (see below), whose sum is σ = 317291520. Its totient is φ = 79843968.

The previous prime is 163953851. The next prime is 163953863. The reversal of 163953855 is 558359361.

163953855 is a `hidden beast` number, since 1 + 63 + 9 + 538 + 55 = 666.

It is not a de Polignac number, because 163953855 - 2² = 163953851 is a prime.

It is a super-2 number, since 2×163953855² = 53761733138722050, which contains 22 as substring.

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 163953855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163953851) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 180312 + ... + 181218.

It is an arithmetic number, because the mean of its divisors is an integer number (4957680).

Almost surely, 2^163953855 is an apocalyptic number.

163953855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

163953855 is a deficient number, since it is larger than the sum of its proper divisors (153337665).

163953855 is a wasteful number, since it uses less digits than its factorization.

163953855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037 (or 1031 counting only the distinct ones).

The product of its digits is 486000, while the sum is 45.

The square root of 163953855 is about 12804.4466885532. The cubic root of 163953855 is about 547.3190244413.

The spelling of 163953855 in words is "one hundred sixty-three million, nine hundred fifty-three thousand, eight hundred fifty-five".