163253805 has 128 divisors (see below), whose sum is σ = 336462336. Its totient is φ = 66908160.

The previous prime is 163253777. The next prime is 163253807. The reversal of 163253805 is 508352361.

163253805 = T₄₃₇₄ + T₄₃₇₅ + ... + T₄₃₉₀.

It is not a de Polignac number, because 163253805 - 2²⁵ = 129699373 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163253807) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4412247 + ... + 4412283.

It is an arithmetic number, because the mean of its divisors is an integer number (2628612).

Almost surely, 2^163253805 is an apocalyptic number.

163253805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

163253805 is an abundant number, since it is smaller than the sum of its proper divisors (173208531).

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

163253805 is a wasteful number, since it uses less digits than its factorization.

163253805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108 (or 86 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 163253805 is about 12777.0812394694. The cubic root of 163253805 is about 546.5389323725.

163253805 divided by its sum of digits (33) gives a triangular number (4947085 = T₃₁₄₅).

The spelling of 163253805 in words is "one hundred sixty-three million, two hundred fifty-three thousand, eight hundred five".